Ukrainian President Volodymyr Zelenskyy stressed on Monday the importance of "unity" between Europe, the United States and Ukraine.

Zelenskyy made the comments as he met with French, German and British leaders in London amid what Kyiv’s European allies described as a “decisive time” in the U.S.-led effort to end Russia's war in Ukraine.

"There are things which are very important for today. I think unity between Europe and Ukraine, and also unity between Europe, Ukraine and the United States," Zelenskyy said sitting alongside UK Prime Minister Keir Starmer, French President Emmanuel Macron and German Chancellor Friedrich Merz.

"There are some things which we can't manage without Americans, things which we can't manage without Europe and that's why we need to make some important decisions."

In an exchange with reporters on Sunday night, U.S. President Donald Trump appeared frustrated with Zelenskyy, claiming the Ukrainian leader “hasn’t yet read" the latest peace proposal.

“Russia is, I believe, fine with it, but I’m not sure that Zelenskyy’s fine with it,” Trump said in Washington. “His people love it, but he hasn’t read it.”

It’s not clear why Trump thought Zelenskyy hadn’t read the plan or who he was saying loved it. Ukrainian officials have made sparing comments about it and few details of the negotiations have been made public.

Starmer, Macron and Merz took a more supportive stance toward Kyiv in comments before their Monday meeting, which lasted about two hours.