MARIUPOL, Ukraine (Reuters) – Fighting for control of this strategic Ukrainian port city ended two months ago with victory for Russia after thousands were killed and hundreds of thousands forced to flee. Many of those who are left in Mariupol now face a new battle: how to survive, said five residents interviewed by Reuters. The struggle for this once bustling city of 430,000 on the shores of the Sea of Azov left it pulverised and with an estimated population in the tens of thousands. On a recent visit by Reuters reporters, who were free to speak to locals and were not escorted by Russian-backe…