Ukrainian President Volodymyr Zelensky accused Russia of wanting to “destroy” the entire eastern region of Donbas, as the last remaining forces in the strategic port of Mariupol prepared on Monday for a final defence. Moscow is pushing for a major victory in the southern city as it works to wrest control of Donbas and forge a land corridor to already-annexed Crimea. But Ukraine has pledged to fight on and defend the city, defying a Russian ultimatum on Sunday that called on the remaining fighters inside the encircled Azovstal steel plant to lay down their arms and surrender. “Russian troops ar…