"From 18:00 (15:00 GMT) to midnight there have been 20 instances of our troops being attacked by the militias of the Donetsk and Lugansk people's republics," the press center said on its Facebook page.
According to the press center, 27 drones were seen flying over the area monitoring the position of the troops.
In April 2014, Kiev launched a military operation in eastern Ukraine in an attempt to suppress the region's independence supporters who refused to recognize the government that came to power after a coup earlier in February.
Several attempts had been made to maintain ceasefire in Ukraine before peace deal was worked out in February 2015 by the leaders of Russia, Ukraine, France and Germany in Minsk, Belarus.
The Organization for Security and Co-operation in Europe (OSCE) is monitoring the implementation of the ceasefire agreement in Ukraine.
