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.

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."

Melania Trump has highlighted Russia's continued attacks on Ukraine in private conversations, President Trump said on Monday.

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

Russian President Vladimir Putin shows no fear of US President Donald Trump's threats and is preparing to continue military operations in Ukraine until the West agrees to his peace terms, Reuters reports.

“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.”

The president left the door open for talks with his Russian counterpart but complained about Russia’s continued aerial attacks on Ukraine.

President Trump discussed how he came to give up on negotiating with Vladimir Putin, during a meeting with NATO Secretary General Mark Rutte at the White House on Monday, as the U.S. agrees to sell new and more weapons to Europe and Ukraine.