This comes after he and Donald Trump got into a tense moment with Ukrainian President Volodymyr Zelensky in the White House last week

By Andrea Shalal and Gram Slattery WASHINGTON (Reuters) -U.S. President Donald Trump has paused military aid to Ukraine following his clash with Ukrainian President Volodymyr Zelenskiy last week, said a White House official,

The order, which takes effect immediately, affects more than $1 billion in arms and ammunition in the pipelines and on order.

For days Trump cabinet officials have suggested Ukraine’s President Volodymyr Zelensky might need to step aside. Yet Ukrainian officials and analysts told CNN any change of president in Kyiv would spark at least six months of political limbo,

Zelensky's comments that a deal to end the war with Russia was "very far away" drew Donald Trump's furious response.

President Volodymyr Zelensky said that if Lindsey Graham were a Ukrainian citizen, his opinions on the president's resignation would hold weight.

Sky News reporter Yalda Hakim asked Ukraine President Zelensky at an event with British reporters Sunday (full replay here) to respond to Sen. Lindsey Graham's comment that Zelensky might have to resign in order for Trump to make a deal with Ukraine and Russia.

The Oklahoma senator said if Ukrainian President Volodymyr Zelensky were removed, that would "spiral Ukraine into chaos."