"If there is no implementation [of Minsk agreements], then appropriate conclusions will be made, then the plan of action will be changed immediately. We are currently acting according to what we signed in Minsk," Pushilin said.
Pushilin stated that the independence supporters had guarantees of the European leaders regarding Ukraine.
"It is important for us to be responsible for our actions, ourselves and our doings," Pushilin told the press.
The measures include a ceasefire between Kiev forces and Donbas independence supporters, the creation of a buffer zone between the two sides through the withdrawal of heavy weaponry from the region and an all-for-all prisoner exchange.
The ceasefire comes into force at midnight on February 15.
This is the second truce agreement between the warring sides. Last September, Kiev and the independence supporters agreed on a ceasefire in the midst of a military conflict in Donbas that started last spring. Despite the deal, clashes between Kiev forces and independence supporters continued in southeastern Ukraine through the end of 2014, intensifying at the start of 2015.