Russian authorities said six people, including a child, were killed in a Ukrainian strike in Russia's Kursk region.
The acting governor of the region added that 10 people were taken to hospital after the attack on the city of Rilsk.
A cultural center, a fitness complex, a school and homes were damaged, the governor added.
It comes after Ukrainian officials said Moscow launched another missile attack on Kiev that reportedly damaged a building in the city center that houses six embassies.
The Foreign Ministry announced that the diplomatic missions of Albania, Argentina, North Macedonia, Palestine, Portugal and Montenegro were affected. It is unclear if the building was directly targeted.
According to the Ukrainian army, at least one person was killed and nine others were injured in the strike, which damaged a number of buildings in the city.
European Union (EU) President Ursula von der Leyen condemned Friday's strike against the Ukrainian capital, calling it “another despicable Russian attack on Kiev”.
Russia has not yet commented.
Ukraine's military said Russia fired 65 drones and missiles across the country overnight, most of which were shot down.
The country's air force said it shot down all five Iskander-M/KN-23 ballistic missiles fired by Russia at Kiev on Friday morning, and the debris caused damage in five areas of the city.
It is not believed that any of the diplomats at the embassy were injured.
Portuguese Foreign Minister Paulo Rangel told local media: “It is absolutely unacceptable that attacks damage or target diplomatic facilities.”