LONDON (Reuters) -Russia’s defence ministry on Wednesday accused Ukrainian forces of disrupting efforts to allow civilians to escape from a chemical plant in an eastern Ukrainian city where a battle has been raging for weeks. Russian forces are trying to grind down Ukrainian resistance in the eastern city of Sievierodonetsk, part of a wider push to drive Kyiv’s forces out of two separatist regions which Russia backs and has recognised as independent states. Russian-backed separatists say up to 1,200 civilians may still be taking shelter in the sprawling Azot ammonia plant. Moscow said it had o…