Here are the latest developments in the war in Ukraine.

Russian forces made significant gains in Ukraine, advancing into the port of Mariupol, destroying an underground weapons depot and leaving a barracks in ruins following one of the deadliest rocket strikes on Ukraine’s military in the nearly month-old war.

Amid the bloodshed, President Volodymyr Zelensky repeated his calls for meaningful peace negotiations with Russia. “I want everyone to hear me now, especially in Moscow. It’s time to meet. Time to talk,” Mr. Zelensky said in his nightly address.

As the fighting raged, Ukraine faced a worsening humanitarian crisis, and military losses mounted on both sides. A senior Ukrainian military official said on Saturday that the strike on the barracks, which happened Friday in the southern city of Mykolaiv, had killed more than 40 marines.

At the city morgue, the bodies of dozens of marines in uniform were laid out side by side in a storage area. A morgue employee would not specify the number of dead brought from the site of the attack.

Here are the latest developments in Ukraine:

• Russia is using long-range missiles to devastating effect, even as its ground advance on key targets remain stalled.

• Russia claimed it fired a missile capable of hypersonic speed in an attack on an ammunition depot in western Ukraine. Such missiles are at the center of an arms race among the United States, Russia and China.

• At least 847 civilians — including 64 children — have been killed since Russia’s invasion of Ukraine, in what United Nations officials say is almost certainly an undercount.

Michael Levenson, Marc Santora, Valerie Hopkins contributed reporting.