Live Updates: Russia and Ukraine Hold Talks After Bloody Weekend

Negotiators from Russia and Ukraine were meeting again on Monday for another round of talks aimed at finding a way out of the increasingly brutal war, even as Russia expanded the targets of its military offensive and the humanitarian catastrophe deepened in Mariupol and other cities ravaged by weeks of bombardment.

A convoy led by a Ukrainian Orthodox priest was headed toward Mariupol carrying 100 tons of medicine and food, President Volodymyr Zelensky of Ukraine said in a speech overnight. But the 50 miles of road the convoy had to navigate were laced with land mines and buffeted by fierce fighting. Every attempt to deliver supplies to Mariupol since the war started has failed.

“But we will try again,” Mr. Zelensky said. “Until we can help our people.”

As the siege of Mariupol, a city key to controlling southern Ukraine and access to the sea, continued over the weekend, Russia broadened its targets, striking a base in western Ukraine about 12 miles from the Polish border and NATO forces. Dozens were killed. Here are some of the latest developments:

Russian and Ukrainian negotiators held a virtual meeting as Ukrainian officials hinted at progress. A priority of the meeting was efforts to provide assistance and facilitate the evacuation of hundreds of thousands of civilians from Mariupol and other besieged cities.