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 just can’t quit Vladimir Putin, with the U.S. president declaring that he’s “not done with him” despite his disappointment in the Russian leader. The relationship between the pair has become increasingly strained over Putin’s refusal to end the war.

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.