Europe would be "very vulnerable" without U.S. support, said Ed Arnold, a senior research fellow at Britain's Royal United Services Institute defense think tank.

Former French President François Hollande asserts that President Donald Trump and his administration are "no longer" allies, saying a U.S.-Europe "divorce" could be on the horizon.

He tones it down with Zelenski, who will go to the White House on Friday, saying he can't believe he calls him a dictator and highlighting that they have "a magnificent relationship" and "he has been very brave".

Zelenskyy remains adamant about NATO membership for Ukraine because it means that other security guarantees are more likely, experts say.

Doubts are growing about the US commitment to European security outside Ukraine, says the BBC's Jeremy Bowen.

President of the United States, Donald Trump, ruled out the possibility of Ukraine joining NATO. During a conference with the Prime Minister of the United Kingdom, Keir Starmer, he expressed hope for a lasting peace in Ukraine but emphasized that NATO's Article 5 would not apply in this case.

President Trump has shredded America’s defense pact with Europe. Now there are signs that longstanding allies are getting serious about cutting their dependence.

President Donald Trump and members of his second administration are continuing their effort to swiftly remodel the federal government, including making far-reaching changes to personnel.On Thursday, Trump is set to meet United Kingdom Prime Minister Keir Starmer at the White House.