Defence minister Rustem Umerov said Ukraine had agreed to “ensure safe navigation, eliminate the use of force, and prevent the use of commercial vessels for military purposes”.
However, Russia claimed it depended on Western sanctions being lifted on fertiliser and food companies and ensuring its access to the SWIFT payments system.
President Zelenskyy said he believed the truce was effective immediately and accused Moscow of playing games.
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“Unfortunately, even now, even today, on the very day of negotiations, we see how the Russians have already begun to manipulate,” he said.
“They are already trying to distort agreements and, in fact, deceive both our intermediaries and the entire world.”
Image: Mr Zelenskyy said Russia was already manipulating over the deal. Pic: Reuters
A White House statement said the US would help “restore Russia’s access to the world market for agricultural and fertiliser exports”.
President Trump said his administration was “looking into” Russia’s request to lift sanctions.
A senior official in the Ukrainian government, speaking anonymously to the AP news agency, said Kyiv did not agree to lifting sanctions as a condition for a maritime ceasefire.
They said Russia had done nothing to have sanctions reversed.
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0:46
Child killed in Russian drone strike on Kyiv
While uncertainty remains over the terms of the Black Sea truce, the Kremlin confirmed it would honour a ceasefire on attacking energy facilities until 17 April.
It said oil refineries, pipelines, power plants and substations, nuclear power plants and hydroelectric dams were all covered by the deal.
It added: “In the event of a violation of the moratorium by one of the parties, the other party has the right to consider itself free from obligations to comply with it.”
Sky News security analyst Michael Clarke said the Black Sea deal was something the US “can boast about” but won’t massively change anything on the ground in Ukraine.
“The Russians will be quite happy about that because they’ll just keep going down more and more rabbit holes,” he said.
“Unless the Americans are prepared to pressure Russia as opposed to just keeping offering them more advantages, the war will just go on,” added Professor Clarke.
Earlier in March, President Zelenskyy said he was ready for a 30-day ceasefire that would also include “the entire front line”.
American secretary of state Marco Rubio said the ball was “in Russia’s court” but President Putin has declined to follow suit and named multiple pre-conditions.
Donald Trump has agreed to send “top of the line weapons” to NATO to support Ukraine – and threatened Russia with “severe” tariffs if it doesn’t agree to end the war.
Speaking with NATO secretary-general Mark Rutte during a meeting at the White House, the US president said: “We’ve made a deal today where we are going to be sending them weapons, and they’re going to be paying for them.
“This is billions of dollars worth of military equipment which is going to be purchased from the United States, going to NATO, and that’s going to be quickly distributed to the battlefield.”
It comes as Ukrainian president Volodymyr Zelenskyy said he had a “very good conversation” with Mr Trump late on Monday. He thanked him for the “willingness to support Ukraine and to continue working together to stop the killings”.
Weapons being sent from to Ukraineinclude surface-to-air Patriot missile systems and batteries, which the country has asked for to defend itself from Russian air strikes.
Mr Trump also said he was “very unhappy” with Russia, and threatened “severe tariffs” of “about 100%” if there isn’t a deal to end the war in Ukraine within 50 days.
The White House added that the US would put “secondary sanctions” on countries that buy oil from Russia if an agreement was not reached.
Analysis: Will Trump’s shift in tone make a difference?
As ever, there is confusion and key questions are left unanswered, but Donald Trump’s announcement on Ukraine and Russia today remains hugely significant.
His shift in tone and policy on Ukraine is stark. And his shift in tone (and perhaps policy) on Russia is huge.
Mr Zelenskyy previously criticised Vladimir Putin’s “desire to drag [the war] out”, and said Kyiv was “working on major defence agreements with America”.
It comes after weeks of frustration from Mr Trump over Mr Putin’s refusal to agree to an end to the conflict, with the Russian leader telling the US president he would “not back down”from Moscow’s goals in Ukraine at the start of the month.
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1:28
Trump threatens Russia with ‘severe’ tariffs’
During the briefing on Monday, Mr Trump said he had held calls with Mr Putin where he would think “that was a nice phone call”, but then “missiles are launched into Kyiv or some other city, and that happens three or four times”.
“I don’t want to say he’s an assassin, but he’s a tough guy,” he added.
After Mr Trump’s briefing, Russian senator Konstantin Kosachev said on Telegram: “If this is all that Trump had in mind to say about Ukraine today, then all the steam has gone out.”
Meanwhile, Mr Zelenskyy met with US special envoy Keith Kellogg in Kyiv, where they “discussed the path to peace” by “strengthening Ukraine’s air defence, joint production, and procurement of defence weapons in collaboration with Europe”.
He thanked both the envoy for the visit and Mr Trump “for the important signals of support and the positive decisions for both our countries”.
Donald Trump has agreed to send “top of the line weapons” to NATO to support Ukraine – and threatened Russia with “severe” tariffs if it doesn’t agree to end the war.
Speaking with NATO secretary general Mark Rutte during a meeting at the White House, the US president said: “We’ve made a deal today where we are going to be sending them weapons, and they’re going to be paying for them.
“This is billions of dollars worth of military equipment which is going to be purchased from the United States,” he added, “going to NATO, and that’s going to be quickly distributed to the battlefield.”
Weapons being sent include surface-to-air Patriot missile systems and batteries, which Ukrainehas asked for to defend itself from Russian air strikes.
Image: Pic: Reuters
Mr Trump also said he was “very unhappy” with Russia, and threatened “severe tariffs” of “about 100%” if there isn’t a deal to end the war in Ukraine within 50 days.
The White House added that the US would put “secondary sanctions” on countries that buy oil from Russia if an agreement was not reached.
It comes after weeks of frustration from Mr Trump against Vladimir Putin’s refusal to agree to an end to the conflict, with the Russian leader telling the US president he would “not back down”from Moscow’s goals in Ukraine at the start of the month.
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0:27
Trump says Putin ‘talks nice and then bombs everybody’
During the briefing on Monday, Mr Trump said he had held calls with Mr Putin where he would think “that was a nice phone call,” but then “missiles are launched into Kyiv or some other city, and that happens three or four times”.
“I don’t want to say he’s an assassin, but he’s a tough guy,” he added.
After Mr Trump’s briefing, Russian senator Konstantin Kosachev said on Telegram: “If this is all that Trump had in mind to say about Ukraine today, then all the steam has gone out.”
Meanwhile, Mr Zelenskyy met with US special envoy Keith Kellogg in Kyiv, where they “discussed the path to peace” by “strengthening Ukraine’s air defence, joint production, and procurement of defence weapons in collaboration with Europe”.
He thanked both the envoy for the visit and Mr Trump “for the important signals of support and the positive decisions for both our countries”.
At least 30 people have been killed in the Syrian city of Sweida in clashes between local military groups and tribes, according to Syria’s interior ministry.
Officials say initial figures suggest around 100 people have also been injured in the city, where the Druze faith is one of the major religious groups.
The interior ministry said its forces will directly intervene to resolve the conflict, which the Reuters news agency said involved fighting between Druze gunmen and Bedouin Sunni tribes.
It marks the latest episode of sectarian violence in Syria, where fears among minority groups have increased since Islamist-led rebels toppled President Bashar al Assad in December, installing their own government and security forces.
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6:11
In March, Sky’s Stuart Ramsay described escalating violence within Syria
The violence reportedly erupted after a wave of kidnappings, including the abduction of a Druze merchant on Friday on the highway linking Damascus to Sweida.
Last April, Sunni militia clashed with armed Druze residents of Jaramana, southeast of Damascus, and fighting later spread to another district near the capital.
But this is the first time the fighting has been reported inside the city of Sweida itself, the provincial capital of the mostly Druze province.
The Syrian Observatory for Human Rights (SOHR) reports the fighting was centred in the Maqwas neighbourhood east of Sweida and villages on the western and northern outskirts of the city.
It adds that Syria’s Ministry of Defence has deployed military convoys to the area.
Western nations, including the US and UK, have been increasingly moving towards normalising relations with Syria.
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0:47
UK aims to build relationship with Syria
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Concerns among minority groups have intensified following the killing of hundreds of Alawites in March, in apparent retaliation for an earlier attack carried out by Assad loyalists.
That was the deadliest sectarian flare-up in years in Syria, where a 14-year civil war ended with Assad fleeing to Russia after his government was overthrown by rebel forces.
The city of Sweida is in southern Syria, about 24 miles (38km) north of the border with Jordan.