By Alexandros Avramidis MOUNT ATHOS, Greece (Reuters) – The Ukrainian soldiers arrived in Greece with marks of war – one with a head scar, another with both legs amputated above the knee, some with invisible mental wounds from a three-year conflict that has ravaged their homeland. The men, 22 in all, had taken a bus more than 1,000 km (620 miles) from the Ukrainian city of Lviv to a monastery