Russia bombarded Ukraine with ballistic missiles and drones on Sunday that killed one person and wounded at least seven others, the latest in a series of deadly attacks that President Volodymyr Zelensky of Ukraine has said makes clear Moscow has little real interest in cease-fire negotiations.

While Russian drone and missile attacks have been unrelenting throughout more than three years of war, they have intensified in recent weeks amid ongoing peace talks led by the Trump administration.

The Ukrainian authorities said the barrage on Sunday killed one man, damaged buildings and started fires in three neighborhoods of Kyiv, the capital. Damage and injuries were also reported elsewhere in Ukraine, as the country declared a day of mourning for a deadly strike on Friday in the city of Kryvyi Rih in central Ukraine.

A missile strike on a residential neighborhood there killed 19 people, including nine children, and wounded 74 others. It damaged the courtyard of an apartment block, and emergency medical workers found some of the wounded in a playground, videos released by Ukraine’s emergency services showed. Russia’s ministry of defense said the missile hit a gathering of Ukrainian and foreign military personnel.

But a U.N. team that visited the site said, citing witnesses, that a meeting of beauticians, not military personnel, had been underway at a nearby restaurant when the missile struck.

Most of the children died while playing in a park, the United Nations said in a statement by the High Commissioner for Human Rights, Volker Turk. It was the deadliest single strike for children of the war, said Mr. Turk, who called the attack with a cluster munition warhead “an unimaginable horror.”