KIEV, May 21 - One Ukrainian serviceman has been killed and eight wounded in fresh separatist attacks, the military said in Kiev on Thursday, as the OSCE security watchdog warned of a "worrisome" spread of violence in eastern Ukraine, Reuters reported.

Fighting has lessened significantly since a ceasefire between Ukrainian forces and Russian-backed rebels was declared in mid-February, but both sides accuse the other of violations and casualties are reported almost daily.