The breach of the Nova Kakhovka dam is most worrying for what it says about the mind of Russian President Vladimir Putin and his generals – and their capacity for dangerous escalation.
It takes the war in an even more perilous direction.
The military impact is likely to be temporary. Armies blow dams or use them to unleash floodwaters for tactical advantage.
The Soviets and the Germans both did it in the Second World War.
But the gains generally do not hold. Water drains away, the ground dries out.
Ben Barry, a land war senior fellow at the International Institute of Strategic Studies, said: “It could set back any assault river crossing for a couple of weeks.
“Difficult to tell for how long. But only once the water subsides and the ground dries out will Ukraine have the same chance of a river crossing as it did before the flood.”
And he believes an attack across the swollen Dnipro is not out of the question even now.
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“It’s not impossible to do an assault river crossing across a river that’s in full flood. It’s just more difficult,” he said.
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2:57
Kherson main square ‘awash with water’
The Russians have blamed the Ukrainians for the attack, but most analysts have dismissed that as unlikely to impossible.
The Russians have a proven track record for accusing the other side of doing what they have themselves done. And the Russians have most to gain. Up to a point.
The breach benefits the Russians by reducing the length of the frontline it has to defend and allowing it to focus attention in the east, but not indefinitely.
And it has blowback for the Russians too, flooding some of the defensive positions they have dug in on the southern bank since retreating there last August.
So temporary gain, some self-harm and all the opprobrium that comes with carrying out yet another war crime.
Where is the margin in that for Vladimir Putin? It looks rash and premature. A disproportionate and irrational act.
But that may be the point.
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3:27
Ukraine dam attack explained
Russian president ‘excels in scare tactics’
In war, it can pay to do the crazy thing, to look unhinged and keep your enemy guessing at your next act of madness.
Putin excels in scare tactics and knows the dam blast makes him look more dangerous.
If Russia was irresponsible enough to blow the dam and unleash such destruction for limited advantage, what will it do next, planners in Kyiv and the West will be asking.
The fear now is for the Zaporizhzhia nuclear power plant. The dam breach endangers the supply of water to its cooling systems. Could Russia now sabotage the plant to change the course of the war?
The destruction of the dam undoubtedly changes the risk calculus in handling Russia, but correctly calibrating it will need cool heads so it is not overdone.
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1:31
Ukraine war: Major dam attack
Putin has, after all, indulged in nuclear sabre-rattling for much of this war.
It has weighed on the minds of Ukraine’s allies and made them more timid in arming Kyiv.
But so far analysts say his nuclear bluster is just that.
Image: The Zaporizhzhia nuclear power plant. Pic: File
The nuclear option
There is no sign of Putin starting the lengthy process of bringing tactical warheads out of storage and deploying them.
And any disaster at Zaporizhzhia threatens Russia most.
The prevailing winds would be most likely to carry the fallout east across the Russian border.
The Russians have shown stunning disregard for the welfare of their own soldiers but a radioactive cloud over their defensive positions and logistics lines would be challenging to say the least.
What we can say for sure is this war has swung again in a more unpredictable direction and the longer it goes on, the more such lurches are likely to happen.
To the sound of mournful chants and the slow beat of drums, they march, whipping their backs with metal flails.
It is an ancient ceremony going back almost 14 centuries – the Shia commemoration of Ashura.
But this year in particular has poignant significance for Iranians.
The devout remember the betrayal and death of the Imam Hussein as if it happened yesterday.
Image: Iranians gather ahead of Ashura
We filmed men and women weep as they worshipped at the Imamzadeh Saleh Shrine in northern Tehran.
The grandson of the Prophet Muhammad was killed by the armies of the Caliph Yazid in the seventh century Battle of Karbala.
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Shia Muslims mark the anniversary every year and reflect on the virtue it celebrates – of resistance against oppression and injustice. But more so than ever this year, in the wake of Israel and America’s attacks on their country.
The story is one of prevailing over adversity and deception. A sense of betrayal is keenly felt here by people and officials.
Image: Men and women weeped as they worshipped at the Imamzadeh Saleh Shrine
Many Iranians believe they were lured into pursuing diplomacy as part of a ruse by the US.
Iran believed it was making diplomatic progress in talks with America, which it hoped could lead to a deal. Then Israellaunched its attacks and, instead of condemning them, the US joined in.
“Death to Israel” chants resounded outside the mosque in skies that for 12 days were filled with the sounds of Israeli jets.
There is a renewed sense of defiance here.
One man told us: “The lesson to be learned from Hussein is not to give in to oppression, even if it is the most powerful force in the world.”
Image: ‘I don’t think about Trump. Nobody likes him,’ one woman tells Sky News
A woman was dismissive about the US president.
“I don’t think about Trump. Nobody likes him. He always wants to attack too many countries.”
Pictures on billboards nearby link Imam Hussein’s story and current events. They show the seventh century imam on horseback alongside images of modern missiles and drones from the present day.
Other huge signs remember the dead. Iran says almost 1,000 people were killed in the strikes, many of them women and children.
Officially Iran is projecting defiance, but not closing the door to diplomacy.
Government spokeswoman Dr Fatemeh Mohajerani told Sky News that Israel should not even think about attacking again.
“We are very strong in defence, and as state officials have announced, this time Israel will receive an even stronger response compared to previous times. We hope that Israel will not make such a mistake.”
Image: Dr Fatemeh Mohajerani said it would be a mistake for Israel to attack again
But there is also a hint of conciliation. Senior Iranian officials have told Sky News back-channel efforts are under way to explore new talks with the US.
Israel had hoped its attacks could topple the Iranian leadership. Those hopes proved unfounded. The government is in control here.
For many Iranians it seems quite the opposite happened – the 12-day war has brought them closer together.
Two American security workers in Gaza were injured after grenades were thrown during food distribution in Khan Younis, the Gaza Humanitarian Foundation (GHF) has said.
In a statement, the US and Israeli-backed aid group said a targeted terrorist attack was carried out at one of its sites in southern Gazaon Saturday morning.
The two Americans injured “are receiving medical treatment and are in stable condition,” it said, adding that the delivery of aid was “otherwise successful” and that “no local aid workers or civilians were harmed”.
GHF didn’t say exactly when the incident happened but claimed Hamaswas behind the attack, adding: “GHF has repeatedly warned of credible threats from Hamas, including explicit plans to target American personnel, Palestinian aid workers, and the civilians who rely on our sites for food.
“Today’s attack tragically affirms those warnings.”
Later, the aid group posted a picture on social media, which it said showed “fragments of a grenade packed with ball bearings” that was used in the attack.
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Asked by Sky’s US partner network, NBC News, whether the two injured individuals were responsible for handing out aid or were responsible for providing security, GHF said they were “American security workers” and “two American veterans.”
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The aid group did not provide specific evidence that Hamas was behind the attack.
The US and Israeli-backed group has been primarily responsible for aid distribution since Israel lifted its 11-week blockade of the Gaza Strip in May.
According to Gaza’s health ministry, 600 Palestinians have been killed while seeking aid from GHF sites as of 3 July, which charities and the UN have branded “death traps”.
Meanwhile, the Associated Press has reported that Israeli-backed American contractors guarding GHF aid centres in Gaza are using live ammunition and stun grenades.
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1:34
Contractors allege colleagues ‘fired on Palestinians’
GHF has vehemently denied the accusations, adding that it investigated AP’s allegations and found them to be “categorically false”.
Israel’s military added that it fires only warning shots and is investigating reports of civilian harm.
It denies deliberately shooting at any innocent civilians and says it’s examining how to reduce “friction with the population” in the areas surrounding the distribution centres.
Hamas has said it has “submitted its positive response” to the latest proposal for a ceasefire in Gaza to mediators.
The proposal for a 60-day ceasefire was presented by US President Donald Trump, who has been pushing hard for a deal to end the fighting in Gaza, with Israeli Prime Minister Benjamin Netanyahu set to visit the White House next week to discuss a deal.
Mr Trump said Israel had agreed to his proposed ceasefire terms, and he urged Hamas to accept the deal as well.
Hamas’ “positive” response to the proposal had slightly different wording on three issues around humanitarian aid, the status of the Israeli Defence Forces inside Gaza and the language around guarantees beyond the 60-day ceasefire, a source with knowledge of the negotiations revealed.
But the source told Sky News: “Things are looking good.”
Image: A woman cries after her son was killed while on his way to an aid distribution centre. Pic: AP/Jehad Alshrafi
Hamas said it is “fully prepared to immediately enter into a round of negotiations regarding the mechanism for implementing this framework” without elaborating on what needed to be worked out in the proposal’s implementation.
The US said during the ceasefire it would “work with all parties to end the war”.
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A Hamas official said on condition of anonymity that the truce could start as early as next week.
Image: An Israeli army tank advances in the Gaza Strip, as seen from southern Israel. Pic: AP/Leo Correa
But he added that talks were needed first to establish how many Palestinian prisoners would be released in return for each freed Israeli hostage and to specify the amount of humanitarian aid that will be allowed to enter Gaza during the ceasefire.
He said negotiations on a permanent ceasefire and the full withdrawal of Israeli troops from Gaza in return for the release of the remaining hostages would start on the first day of the truce.
Hamas has been seeking guarantees that the 60-day ceasefire would lead to a total end to the nearly 21-month-old war, which caused previous rounds of negotiations to fail as Mr Netanyahu has insisted that Israel would continue fighting in Gaza to ensure the destruction of Hamas.
The Hamas official said that Mr Trump has guaranteed that the ceasefire will extend beyond 60 days if necessary to reach a peace deal, but there is no confirmation from the US of such a guarantee.
Speaking to journalists on Air Force One, Mr Trump welcomed Hamas’s “positive spirit” to the proposal, adding that there could be a ceasefire deal by next week.
Image: Palestinians dispersing away from tear gas fired at an aid distribution site in Gaza. Pic: AP
Image: A girl mourns the loss of her father, who was killed while heading to an aid distribution hub. Pic: AP/Jehad Alshrafi
Hamas also said it wants more aid to flow through the United Nations and other humanitarian agencies, which comes as the UN human rights officer said it recorded 613 Palestinians killed in Gaza within a month while trying to obtain aid.
Most of them were said to have been killed while trying to reach food distribution points by the controversial US- and Israeli-backed Gaza Humanitarian Foundation (GHF).
The spokeswoman for the UN human rights office, Ravina Shamdasani, said the agency was not able to attribute responsibility for the killings, but added that “it is clear that the Israeli military has shelled and shot at Palestinians trying to reach the distribution points” operated by GHF.
Image: Palestinians carry aid packages near the GHF distribution centre in Khan Younis. Pic: AP/Abdel Kareem Hana
Ms Shamdasani said that of the total tallied, 509 killings were “GHF-related”, meaning at or near its distribution sites.
The GHF accused the UN of taking its casualty figures “directly from the Hamas-controlled Gaza health ministry” and of trying “to falsely smear our effort”, which echoed statements to Sky News by the executive director of GHF, Johnnie Moore.