Mulholland was already frustrated over U.S. President Donald Trump's threats of crippling tariffs on imported goods from Canada and talk about the country becoming the 51st state. The final straw came when Trump referred to Ukraine President Volodymyr Zelenskyy as a dictator.

President Trump and Ukrainian President Zelenskyy are in an escalating war of words following the U.S. meeting with Russia. NBC News’ Richard Engel reports the latest details. Igor Novikov, a former advisor to Zelenskyy,

President Donald Trump on Friday continued his ongoing attacks against Ukrainian President Volodymyr Zelenskyy as tensions between the two leaders exploded onto the public stage this week.

In an interview Sunday on ABC News' "This Week," Democratic Sen. Jack Reed decried President Donald Trump's recent verbal attacks on Ukrainian President Volodymyr Zelenskyy and increased alignment with Russia.

"Without future security guarantees, we will not have a real ceasefire," Zelenskyy said. "And if we don't have it nothing will work. Nothing will work."

Taoiseach Micheál Martin and President Volodymyr Zelenskyy discussed how to advance a "durable peace in Ukraine" during their meeting in Shannon. Zelenskyy was en route to meet President Donald Trump in the US.

Watch as President Donald Trump speaks at the Oval Office as Ukrainian President Volodymyr Zelenskyy said Friday that his country wants “security guarantees” before any talks with Russia.

President Donald Trump’s envoy to Ukraine and Russia says he's held “extensive and positive discussions” with Ukraine’s President Volodymyr Zelenskyy about the three-year war.

President Donald Trump says Ukrainian leader Volodymyr Zelenskyy will visit the White House on Friday to sign a long-sought minerals deal that will closely tie the two countries together.

Ukrainian President Volodymyr Zelenskyy said he would like to ask President Trump directly if the U.S. is stopping its support or not, and whether Ukraine might be able to buy weapons with frozen Russian assets.