By Michelle Nichols UNITED NATIONS (Reuters) – The 193-member United Nations General Assembly began meeting on the crisis in Ukraine on Monday ahead of a vote this week to isolate Russia by deploring its “aggression against Ukraine” and demanding Russian troops stop fighting and withdraw. The General Assembly will vote this week on a draft resolution similar to a text vetoed by Russia in the 15-member Security Council on Friday. No country has a veto in the General Assembly and Western diplomats expect the resolution, which needs two-thirds support, to be adopted. While General Assembly resolu…