The Kremlin said on Monday that President Vladimir V. Putin had ordered a three-day cease-fire in Ukraine next month, the second time in two weeks that Russia’s leader has promised a temporary pause in the fighting as President Trump shows growing impatience with his refusal to stop the war.

The ceasefire would be held as Russia hosts celebrations of the 80th anniversary of the victory of the Soviet Union and its allies in World War II.

Russian President Vladimir Putin declared a three-day ceasefire next month in the country’s war against Ukraine, as President Trump signals a growing impatience with the Russian leader’s