Setting red lines is all very well, as long as you follow through when they are crossed. President Joe Biden knows that all too well.
But he also knows that if he follows through on this big new red line of withholding offensive weapons for Israel it could cost him dearly domestically.
The push-me-pull-you balance of geopolitics and domestic politics is intensely difficult right now for the American president.
I’ll break this down into two parts. The politics in a moment. First the challenges of red lines.
Western leaders throw them down in interviews, like Mr Biden’s pronouncement on CNN last night, as unequivocal threats. “Cross the line, if you dare!” is the rhetoric.
But too often they turn out to be flawed tools of geo-political diplomacy.
Barack Obama set a chemical weapons red line with Syria’s Bashar al Assad in 2012. He walked right through it.
Vladimir Putin remembered that when he walked through a red line Mr Biden had set on Ukraine in 2021. Mr Putin invaded. The rest is history.
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Every red line is distinct, of course, and they vary in terms of the gravity of the event they are seeking to prevent.
But the principle behind laying them is the same, as is the message set when they are crossed.
Image: Joe Biden with Vladimir Putin during their meeting in Moscow in 2011. Pic: AP
Biden’s frustration with Netanyahu
Over the past six months, as Israel has sought to defeat Hamas in Gaza, President Biden didn’t think he’d need to lay out red lines. After all, Israel is one of America’s closest allies.
Instead, the Biden administration thought gentle diplomacy and frank back-channels with a “close friend of America” would do the trick.
But gradually, as Mr Biden and the Netanyahu government increasingly diverged on protecting civilians and a plan for “the day after” in Gaza, a red line began to appear – Rafah.
This has become Mr Biden’s red line for Israel.
The American president has repeatedly made clear his opposition to Mr Netanyahu’s insistence on a ground invasion of the southern Gazan city (Mr Netanyahu’s own red line) where about 1.4 million people are living, half of them under 18.
Image: Smoke rises from Rafah after an Israeli airstrike on the Gaza city this week. Pic: AP
That fact has allowed the Biden administration to claim its red line hasn’t yet been crossed. “They didn’t describe it as a major ground operation,” spokesman John Kirby said this week.
Sometimes, red lines are smashed through. Sometimes, they are gradually chipped away at.
To counter the chipping Mr Netanyahu has been doing for weeks, Mr Biden hardened his red line.
“I made it clear that if they go into Rafah – they haven’t gone in Rafah yet – if they go into Rafah, I’m not supplying the weapons that have been used historically to deal with Rafah, to deal with the cities – that deal with that problem,” he told CNN.
A significant admission
That he has personally admitted what was already a fact – that American weapons have killed thousands of civilians – is significant.
But there is important nuance in his red line.
He’s talking about stopping the delivery of offensive weapons for the type of operations that have flattened much of Gaza and could do the same to Rafah.
He is not threatening to cut Israel off from all US weapons, of course not.
Defensive weapons to counter Iranian proxy rockets will keep coming. As will long-range weapons and jets to counter Iran. None of that will stop being delivered.
Still, it’s a big shift for Biden. It’s not been done before and symbolically for Israel, in the middle of its longest and most critical war, it looks terrible.
The domestic political risks
And that brings us to the domestic politics of all this.
For every lever of influence Mr Biden pulls (and he’s seen they have their limited use) there is a domestic political calculus.
Pretty much all Republicans are against every lever; they want nothing less than unequivocal support for Israel.
More than that though – a significant number of his own Democrats will also be uneasy about America limiting weapons for Israel.
But critical voters in key states are very pro-Palestine. President Biden isn’t oblivious to their cry “Genocide Joe!”
It is a perilous political push-me-pull-you and the election is six months away.
Donald Trump has criticised Vladimir Putin and suggested a shift in his stance towards the Russian president after a meeting with Volodymyr Zelenskyy before the Pope’s funeral.
The Ukrainian president said the one-on-one talks could prove to be “historic” after pictures showed him sitting opposite Mr Trump, around two feet apart, in the large marble hall inside St Peter’s Basilica.
The US president said he doubted his Russian counterpart’s willingness to end the war after leaving Rome after the funeral of Pope Francis at the Vatican.
In a post on his Truth Social platform, he said “there was no reason” for the Russian president “to be shooting missiles into civilian areas, cities and towns, over the last few days”.
Image: The two leaders held talks before attending the Pope’s funeral
He added: “It makes me think that maybe he doesn’t want to stop the war, he’s just tapping me along, and has to be dealt with differently, through ‘Banking’ or ‘Secondary Sanctions?’ Too many people are dying!!!”
The meeting between the US and Ukrainian leaders was their first face-to-face encounter since a very public row in the Oval Office in February.
Mr Zelenskyy said he had a good meeting with Mr Trump in which they talked about the defence of the Ukrainian people, a full and unconditional ceasefire, and a durable and lasting peace that would prevent the war restarting.
Other images released by the Ukrainian president’s office show Sir Keir Starmer and French President Emmanuel Macron were present for part of the talks, which were described as “positive” by the French presidency.
Mr Zelenskyy‘s spokesman said the meeting lasted for around 15 minutes and he and Mr Trump had agreed to hold further discussions later on Saturday.
Image: The world leaders shared a moment before the service
Image: Donald Trump and Volodymyr Zelenskyy meet in the Basilica
But the US president left Rome for Washington on Air Force One soon after the funeral without any other talks having taken place.
The Ukrainian president’s office said there was no second meeting in Rome because of the tight schedule of both leaders, although he had separate discussions with Mr Starmer and Mr Macron.
The French president said in a post on X “Ukraine is ready for an unconditional ceasefire” and that a so-called coalition of the willing, led by the UK and France, would continue working to achieve a lasting peace.
There was applause from some of the other world leaders in attendance at the Vatican when Mr Zelenskyy walked out of St Peter’s Basilica after stopping in front of the pontiff’s coffin to pay his respects.
Image: Donald Trump and the Ukrainian president met for the first time since their Oval Office row. Pic: Reuters
Sir Tony Brenton, the former British ambassador to Russia, said the event presents diplomatic opportunities, including the “biggest possible meeting” between Mr Trump and the Ukrainian leader.
He told Sky News it could mark “an important step” in starting the peace process between Russia and Ukraine.
Professor Father Francesco Giordano told Sky News the meeting is being called “Pope Francis’s miracle” by members of the clergy, adding: “There’s so many things that happened today – it was just overwhelming.”
The bilateral meeting comes after Mr Trump’s peace negotiator Steve Witkoff held talks with Mr Putin at the Kremlin.
They discussed “the possibility of resuming direct negotiations between Russia and Ukraine”, Kremlin aide Yuri Ushakov said.
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On an extraordinary day, remarkable pictures on the margins that capture what may be a turning point for the world.
In a corner of St Peter’s Basilica before the funeral of Pope Francis, the leaders of America and Ukraine sit facing each other in two solitary chairs.
They look like confessor and sinner except we cannot tell which one is which.
In another, the Ukrainian president seems to be remonstrating with the US president. This is their first encounter since their infamous bust-up in the Oval Office.
Image: The two leaders held talks before attending the Pope’s funeral
Other pictures show the moment their French and British counterparts introduced the two men. There is a palpable sense of nervousness in the way the leaders engage.
We do not know what the two presidents said in their brief meeting.
But in the mind of the Ukrainian leader will be the knowledge President Trump has this week said America will reward Russia for its unprovoked brutal invasion of his country, under any peace deal.
Mr Trump has presented Ukraine and Russia with a proposal and ultimatum so one-sided it could have been written in the Kremlin.
Kyiv must surrender the land Russia has taken by force, Crimea forever, the rest at least for now. And it must submit to an act of extortion, a proposed deal that would hand over half its mineral wealth effectively to America.
Image: The world leaders shared a moment before the service
Afterwards, Zelenskyy said it had been a good meeting that could turn out to be historic “if we reach results together”.
They had talked, he said, about the defence of Ukraine, a full and unconditional ceasefire and a durable and lasting peace that will prevent a war restarting.
The Trump peace proposal includes only unspecified security guarantees for Ukraine from countries that do not include the US. It rules out any membership of Ukraine.
Ukraine’s allies are watching closely to see if Mr Trump will apply any pressure on Vladimir Putin, let alone punish him for recent bloody attacks on Ukraine.
Or will he simply walk away if the proposal fails, blaming Ukrainian intransigence, however outrageously, before moving onto a rapprochement with Moscow.
If he does, America’s role as guarantor of international security will be seen effectively as over.
This could be the week we see the world order as we have known it since the end of the Second World War buried, as well as a pope.