MICHAEL KIMMAGE is Professor of History at the Catholic University of America. He is the author of Collisions: The Origins of the War in Ukraine and the New Global Instability.

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.

A planned classical music concert in Italy, featuring a Russian conductor known to be an old friend and vocal supporter of Russian President Vladimir Putin, is sparking furor after the wife of late Russian opposition leader Alexei Navalny urged Italian authorities to cancel it.

“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.”

But his frustration with Putin has grown. Last week, the president said the United States was taking “a lot of bullshit” from Putin. Today, he authorized a significant shipment of U.S. defensive weapons to Ukraine via NATO and threatened Russia with new tariffs if the war does not end in 50 days.

Daniel Martindale, a U.S. citizen who helped the Kremlin target Ukrainian troops and was then spirited out of eastern Ukraine by Russian special forces, has received a Russian passport in Moscow. Russian state television broadcast a report on Tuesday showing Martindale,

Prior to the announcement of the training, the Chinese state-run Global Times published an interview on July 10 with Serbian Lieutenant Colonel Dalibor Aleksic, who commands an air defense unit operating two China-supplied weapon systems: the FK-3 and the HQ-17AE.