(Adds Russia saying “terrible humanitarian catastrophe” unfolding in Mariupol and offering safe passage to those who lay down their arms; Ukrainian deputy prime minister on evacuations) By Pavel Polityuk LVIV, Ukraine (Reuters) – Russian and Ukrainian forces fought for control of the port city of Mariupol on Sunday, local authorities said, while Ukrainian President Volodymyr Zelenskiy 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, Zelenskiy addressed the Israeli parliament by video link and questioned…