OSCE will extend Ukraine mission one year, may expand its size

A vehicle of Special Monitoring Mission of the Organization for Security and Cooperation (OSCE) to Ukraine rides along a convoy of Ukrainian armed forces in Paraskoviyvka, eastern Ukraine, February 26, 2015. REUTERS/Gleb Garanich

VIENNA (Reuters) - The Organisation for Security and Cooperation in Europe (OSCE) will extend its observer mission to Ukraine for one year, until March 2016, and may double its size to 1,000 observers, a spokeswoman said on Thursday.

Ukraine's military said on Tuesday pro-Russian rebels were amassing heavy weapons in depots around separatist-held Donetsk city despite last month's ceasefire deal, which calls for the withdrawal of heavy weapons from the front line.