U.S. President Donald Trump's decision to ramp up arms shipments to Ukraine is a signal to Kyiv to abandon peace efforts, Russia said on Thursday, vowing it would not accept the "blackmail" of Washington's new sanctions ultimatum.

US Ambassador to NATO Matthew Whitaker has said that the Trump administration is trying to deliver US weapons to Ukraine as quickly as possible in line with a plan whereby they will be sold to the Alliance.

Trump on Monday said the United States would ship "billions of dollars' worth" of military equipment to NATO members, paid for by the alliance, to be handed over to Ukrainian forces battling grinding Russian advances. Trump had earlier this month suggested NATO would "100 percent" pay for U.S. weapons, which would be sent to Ukraine.

Trump casts European purchases of US weapons for Ukraine as a victory as UN warns civilians being killed at record rate.

This winter, he tried to humiliate Ukraine's president, and now allows arms transfers to Kyiv. Behind the dramatic shift in Trump's thinking.

Zelensky and Trump consider drone ‘mega-deal’ as Russia steps up attacks - The Ukrainian leader said drones were the key tool that has allowed his country to fight off Russia's invasion for more than

Will Vladimir Putin back down? What should Trump's next move be? And what does the future hold for Ukraine? Newsweek contributors Daniel R. DePetris and Dan Perry debate: Daniel R