Top Russian security official Dmitry Medvedev has responded to Trump warning that Vladimir Putin is "playing with fire." Newsweek's live blog is closed.

Kellogg urged Russia to fulfill its ceasefire promise, while Ukrainian leaders accused Moscow of delaying tactics. Zelensky reported 50,000 Russian troops near Sumy, but noted Ukrainian defensive measures.

Ukraine says Russia launched its biggest drone strike to date after Trump called Putin crazy for stepping up his offensive and "needlessly killing a lot of people."

The American and Russian leaders spoke by phone last week, after which European officials accused the U.S. president of handing Putin a "win" by hinting that Washington would back out of diplomatic negotiations. Trump also refused to impose fresh sanctions on Russia to ramp up pressure on Putin to take negotiations seriously.

Trump's Special Envoy to Ukraine, Keith Kellogg, stated that Russia’s shelling of Ukraine violates the 1977 Geneva Peace Protocols. Kellogg called for a ceasefire, according to his post on social media platform X.

The status quo in Russia-Ukraine peace efforts has not changed after a call between U.S. President Donald Trump and his Russian counterpart, Vladimir Putin, Ukrainian presidential advisor Mykhailo Podolyak said on May 20 on X.

Donald Trump is reported to have made the remarks following his two-hour long phone call with his Vladimir Putin.

Oil prices fell after a two-day rise as the market reacted to signals that US President Donald Trump is backing down on his efforts to end the war between

President Trump issued a warning to Russia and Russian President Putin this week on social media, saying Putin is “playing with fire” for not coming to the negotiating table in Ukraine. Staff writer for The Atlantic Tom Nichols joins Alex Witt to share his insight on this and multiple dismissals at the National Security Council by Trump.

American military leaders have warned that nations are developing advanced missile technologies that outpace existing U.S. defenses.