The leaders of the Normandy Four countries: Russia, France, Germany and Ukraine, held a telephone conversation in the early hours of May 24 over the issue of improving OSCE monitoring in eastern Ukraine.
EurActiv: Normandy Four leaders discuss OSCE monitoring of eastern Ukraine
OSCE (Organization for Security and Co-operation in Europe) observers check a column of fifteen MT-12 Rapira 100-mm anti-tank guns being withdrawn by pro-Russian separatists from Donetsk to the village of Zelene, Donetsk region, on October 28, 2015.