Here are the latest developments in Ukraine.

— Russian rockets rained down across Ukraine before dawn on Sunday, including strikes on the outskirts of Lviv that appeared to target a military base where foreign fighters including Americans were being trained.

— Russia warned on Saturday that arms sent to Ukraine would be considered “legitimate targets” for Russian forces. Hours later, the U.S. promised an additional $200 million in arms and equipment for Ukraine.

— Outside Kyiv, Russia renewed its attack with fierce fighting in the suburbs as it tried to tighten a cordon around the capital.

— Hundreds of people protested in Melitopol over the detention of the city’s mayor, who had refused to cooperate with occupying Russian forces.

— The disarmament chief of the United Nations said the agency had no evidence of any biological weapons program in Ukraine. Russia had accused the U.S. of a plot involving biological weapons labs in Ukraine and migratory birds, bats and insects.