President Donald Trump said Thursday that a phone call with President Vladimir 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,” Trump told reporters.

The apparent impasse came during a roughly hourlong conversation between the leaders Thursday morning — the sixth known call between the two since Trump returned to office in January — that both sides said covered a wide range of issues, including Iran.

Russia underscored the need to resolve contentious matters regarding Iran and its nuclear program exclusively through diplomatic means, the Kremlin’s top foreign policy aide, Yuri Ushakov, told reporters, according to a briefing released by Russian state news. Trump ordered the June 21 bombing of Iran’s nuclear enrichment sites in support of the Israeli bombing campaign that began June 13.

U.S. and Russian leaders agreed to continue contacts between their foreign ministries, defense ministries and presidential aides on the matter, Ushakov said.

On Ukraine, Putin appeared to reiterate his unyielding position on negotiations, which has led many Western officials to question whether he is serious about peace talks. According to Ushakov, Putin told Trump that Russia would continue to press ahead to achieve its war aims and resolve the “root causes” of the conflict.