The UN’s two major bodies — the 193-nation General Assembly and the more powerful 15-member Security Council — are holding separate meetings Monday on Russia’s invasion of Ukraine, reflecting widespread demands for a cease-fire and escalating concern for the millions of Ukrainians caught up in the war.The UN’s two major bodies — the 193-nation General Assembly and the more powerful 15-member Security Council — are holding separate meetings Monday on Russia’s invasion of Ukraine, reflecting widespread demands for a cease-fire and escalating concern for the millions of Ukrainians caught up in the war.