The apparent impasse came during a roughly hourlong conversation between the leaders on Thursday morning.
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.
The apparent impasse came during a roughly hourlong conversation between the leaders on Thursday morning — the sixth known call between the two since Mr. 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. Mr. Trump ordered the June 21 bombing of Iran’s nuclear enrichment sites in support of the Israeli bombing campaign that began on June 13.
U.S. and Russian leaders agreed to continue contacts between their foreign ministries, defense ministries and presidential aides on the matter, Mr. Ushakov said.
On Ukraine, Mr. 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 Mr. Ushakov, Mr. Putin told Mr. Trump that Russia would continue to press ahead to achieve its war aims and resolve the “root causes” of the conflict.
That phrase is often read as Kremlin shorthand for Moscow’s demands that Ukraine cede territory, embrace neutrality, be excluded from joining NATO or other military alliances and be subjected to limits on its military.