In short:
US President Donald Trump has paused all military aid to Ukraine to "ensure that it is contributing a solution" amid the ongoing Russian invasion, White House officials say.
An official said Mr Trump was focused on peace and the White House would review aid delivered to Ukraine to ensure President Volodymyr Zelenskyy was "committed to that goal".
What's next?
France and the United Kingdom are planning to present a plan for a truce to the Trump administration after a planned EU meeting this week.
US President Donald Trump has paused all military aid to Ukraine to "ensure that it is contributing a solution" amid the ongoing Russian invasion, according to White House officials.
The move comes days after the president clashed with Ukrainian President Volodymyr Zelenskyy in the Oval Office over moves to secure peace in Europe. Â
"The president has been clear that he is focused on peace. We need our partners to be committed to that goal as well," an official, speaking on the condition of anonymity
said.
"We are pausing and reviewing our aid to ensure that it is contributing to a solution."Â
Trump warns US will 'not put up' with Zelenskyy stance on Russia
Photo shows Donald Trump in a dark suit and red tie standing at a presidential lectern gesturing with his right hand in front of a US flag
An official also said Mr Trump is focused on reaching a peace deal to end the more than three-year war sparked by Russia's all-out invasion of Ukraine, and wants Mr Zelenskyy "committed" to that goal.
Mr Zelenskyy's office did not immediately respond to a Reuters request for comment outside office hours.
The US State Department said in January the US had provided more than $US65.9 billion ($106.1b) in military assistance to Ukraine since 2022, and $US69.2 billion in aid ($111.4bn) since 2014.
Mr Trump said in a statement after his clash with Mr Zelenskyy on Friday that the US aid included anti-tank javelin missiles and the $US39 million ($62.8m) sale of defensive lethal weapons in 2019.
The move comes after Mr Trump up-ended US policy on Ukraine and Russia upon taking office in January, adopting a more conciliatory stance towards Moscow.
The decision also follows an explosive confrontation with Mr Zelenskyy at the White House on Friday in which Mr Trump criticised him for being insufficiently grateful for Washington's backing in the war with Russia.
That moment came five years after Mr Trump held up congressionally authorised assistance to Ukraine in 2019 as he sought to pressure Mr Zelenskyy to launch investigations into Joe Biden, then a Democratic presidential candidate.Â
That decision led to Mr Trump's first impeachment.
Mr Trump in the lead-up to his 2024 election win vowed to quickly end the war in Ukraine, but has expressed increasing frustration with Mr Zelenskyy over the war, while simultaneously expressing confidence that Russian President Vladimir Putin can be trusted to keep the peace if a truce in the conflict is reached.
On Monday Mr Trump again said Mr Zelenskyy should be more appreciative of US support after earlier responding angrily to an Associated Press report quoting the Ukrainian president as saying the end of the war is "very, very far away".
During a stopover on London for a leaders summit about future Ukrainian security, Volodymyr Zelenskyy said his country's safety could not be guaranteed without the support of the US. (Reuters: Carlos Jasso)
"This is the worst statement that could have been made by Zelenskyy, and America will not put up with it for much longer!" Mr Trump wrote on Truth Social.
Mr Zelenskyy took to social media soon after Mr Trump's latest criticism.
He did not directly refer to Mr Trump's comments, but underscored that it was "very important that we try to make our diplomacy really substantive to end this war the soonest possible".
"We need real peace and Ukrainians want it most because the war ruins our cities and towns," Mr Zelenskyy added.
"We lose our people. We need to stop the war and to guarantee security."
Mineral deal still on the table
The US president also suggested on Monday that a deal to open up Ukraine's minerals to US investment could still be agreed despite his frustration with Kyiv, as European leaders floated proposals for a truce in Russia's war with its neighbour.
The Trump administration views a minerals deal as America's way of earning back some of the tens of billions of dollars it has given to Ukraine in financial and military aid since Russia invaded three years ago.
The Trump administration proposes taking 50 per cent of Ukraine's rare earth minerals as compensation for US aid during the Russia-Ukraine war. (Reuters: Thomas Peter )
When asked on Monday if the deal was dead, Mr Trump said at the White House: "No, I don't think so."
He described it as a "great deal for us" and said he would give an update on the situation on Tuesday night local time when he addressed a joint session of Congress.
The US Congress has approved $US175 billion in total assistance for Ukraine since Russia's invasion nearly three years ago, according to the nonpartisan Committee for a Responsible Federal Budget.
In December, right before leaving office, President Joe Biden announced an additional $US5.9 billion in security and budget assistance.