President Donald Trump announced this week that the U.S. will send Patriot air-defense missiles to Ukraine and threatened new tariffs on Russia. 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:

It remains to be seen just how lasting and severe President Donald Trump’s turn against Vladimir Putin will be. Trump has criticized the Russian president in unprecedented terms in recent days and signaled he’ll send vital weapons to Ukraine.

“Putin will not negotiate as a loser,” one of his longtime associates tells TIME by phone from Moscow. “He knows that winners don’t get punished, and if he wins, all of this” — the sanctions, the tariffs — “will go away.”

President Trump reveals how Russian leader 'talks nice, then bombs everybody' as the U.S. prepares to send Ukraine Patriot missiles under a NATO agreement.

Donald Trump has been growing increasingly angry with Putin ignoring his strict 50-day peace deal – with a senator warning what might come next for Russia if he doesn't step in line

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."

Vladimir Putin’s conduct has prompted Donald Trump’s shift as Russia’s war effort in Ukraine has gotten only more aggressive.

Donald Trump has said that he is disappointed but not done with Vladimir Putin, in an exclusive phone call with the BBC. The US president was pressed on whether he trusts the Russian leader, and replied: "I trust almost no-one."