Some conservative members of Donald Trump's "Make America Great Again" movement have reacted angrily to the president's plans to sell weapons to Nato, arguing it is a betrayal of his promise to end US involvement in foreign wars.

Pentagon officials said details were still being worked out, and experts doubted Mr. Trump’s threat of huge tariffs for Russian trading partners.

Ivo Daalder, a senior fellow at Harvard Belfer Center, says that President Donald Trump realizes that he needs to change course because the Russian leader has been playing him "for years."

Donald Trump’s remarks on Ukraine on Monday were far from the biggest announcement the US president could have made.

Trump’s threats of secondary tariffs are “never going to go anywhere” as long as he is unwilling to impose costs on Moscow directly, Keir Giles, a senior fellow at the London-based Chatham House think tank, told NBC News Monday.

The Patriot surface-to-air missile system has become one of Ukraine's most important platforms during Russia's full-scale invasion, which began in February 2022. Since 2023, Patriots in Ukraine have been used to down drones, ballistic missiles and Russian aircraft.

President Donald Trump will meet with NATO Secretary General Mark Rutte on Monday, a day after the president announced the United States is looking to sell NATO allies weapons that can be passed on to Ukraine.