By Natalia Zinets LVIV, Ukraine (Reuters) – Russia on Thursday appeared to give the most damning assessment so far of its invasion, describing the “tragedy” of mounting troop losses and the economic hit as Ukrainians were evacuated from eastern cities before an anticipated major offensive. Moscow’s six-week long incursion has seen more than 4 million people flee abroad, killed or injured thousands, left a quarter of the population homeless, turned cities into rubble and led to Russia’s near total isolation on the world stage. In a symbolic move, the United Nations General Assembly suspended it…