A Russian citizen was injured and her husband killed after Moscow launched a missile attack on Kyiv, Volodymyr Zelenskyy has said.
One person was killed and five injured, including a child, as the Ukrainian capital was hit for the first time in three weeks on Sunday - coinciding with the leaders of the G7 meeting in Germany
In his daily address, Zelenskyy said the man who died was 37 and that his seven-year-old daughter, Zhenya, is receiving treatment at a children's hospital in Kyiv.
"Her mother was also wounded. By the way, she is a citizen of Russia. That's that," he added.
"She was not threatened by anything in our country, she was completely safe, until Russia itself decided that everything was equally hostile to them now - women, children, kindergartens, apartment buildings, hospitals, railways," he said.
Russian weapons hit the nine-storey apartment block in the central Shevchenkivskiy district.
A kindergarten was also hit just 400 metres away.
Vitali Klitschko, Kyiv’s mayor, accused Vladimir Putin of committing genocide as he toured the site of the damage on Sunday afternoon.
“Vladimir Putin finds any reason to attack Kyiv,” he said. “Why does he want to kill civilians? It is genocide.”
He also claimed the assault was a "symbolic attack" by the Kremlin ahead of this week's Nato summit in Madrid.
Kyiv had begun to return to some level of normality after months of being under attack by the Russian military following Vladimir Putin's order to invade in February.
Having failed to take over the capital and after his troops were pushed out of the north of the country by Ukrainian Defence Forces, Putin ordered a fresh offensive on the Donbas region in the south east.
Russia has been making progress in the east, and on Saturday pro-Russian forces claimed control of the strategically import city of Severodonetsk.
After Russian forces confirmed their takeover, Zelenskyy said it was a difficult day, "morally and emotionally" for his nation.
Regional authorities urged civilians on Monday to leave the city of Lysychansk, as Russian forces increased their advance.
Serhiy Gaidai, the governor of the Luhansk region which includes Lysychansk, wrote on the Telegram messaging app: "The situation in the city is very difficult."
According to Ukrainian authorities, more than 35,000 Russian soldiers have so far died since they mounted the invasion.
It was not just Kyiv which was hit with artillery over the weekend, Zelenskyy added.
"Missiles also hit the Mykolaiv region, the Chernihiv region, Odesa, Cherkasy. Artillery and mortar shelling did not stop in the Kharkiv region, in the Sumy region, in Donbas, in the south of our state," he said.
Zelenskyy also addressed people in Belarus, saying they are "being pulled into the war".
"You are not slaves or cannon fodder. You do not have to die and prevent anyone from deciding what awaits you next. I know that the people of Belarus support Ukraine," he added.
"They support us, surely us and not the war. And that is why the Russian authorities want to pull you, all Belarusians, into war, it wants to sow hatred between us."