DONETSK, December 16. /TASS/. Ukraine’s forces have started reinforcing their grouping in Donbass, redeploying tanks and attack aviation to the contact line in the self-proclaimed Donetsk People’s Republic, Daniil Bezsonov, a spokesman for the DPR defense ministry, said on Sunday.

"Over the past two days, tank and mechanized battalions of the 93rd mechanized brigade have been unloaded at the Konstantinovka railway station, increasing the grouping by more than 60 tanks and infantry fighting vehicles," the Donetsk News Agency said.

The DPR intelligence has reported that four Su-25 aircraft have been sent from the Melitopol to the Berdyansk airfield. These attack planes may be used for fire support operations during a massive air strike, he said.

The Kiev forces are also planning to reinforce their grouping in the Gorlovka direction by militants of the Right Sector (extremist group, outlawed in Russia) volunteer units, the spokesman said. "According to our data, 24 reserve hundreds have been formed, up to 150 gunmen in each," he stressed.

Since the beginning of the Donbass conflict in April 2014 the sides have declared more than 20 ceasefires. The latest agreement of the Contact Group on the so-called "back-to-school" ceasefire took effect on August 29. However, no lasting truce has been achieved so far.