Russian and Ukrainian forces fought for control of the port city of Mariupol on Sunday, local authorities said, while Ukrainian President Volodymyr Zelenskyy appealed to Israel for help in pushing back the Russian assault on his country.

In the latest appeal he has made for assistance from abroad, Zelenskyy addressed the Israeli parliament by video link and questioned Israel's reluctance to sell its Iron Dome missile defense system to Ukraine.

"Everybody knows that your missile defense systems are the best ... and that you can definitely help our people, save the lives of Ukrainians, of Ukrainian Jews," said Zelenskyy, who is of Jewish heritage.