President Donald Trump said he’d ship more weapons to Ukraine, marking an apparent reversal after the Pentagon halted flows of some air-defense missiles and artillery shells to the country.

President Trump said on Thursday that a phone call with President Vladimir V. Putin of Russia had not resulted in any movement toward ending the war in Ukraine, adding that he was “not happy” with the conflict grinding on. “I didn’t make any progress with him at all,” Mr. Trump told reporters.