In response , the Ukrainian Yatsenyuk Government created Creating the first Anti-Terrorist Operations zone ( ATO ) and launched Process_start a series of counter-offensives against the insurgents , resulting in a standoff Hostile_encounter and violent skirmishes .

To maintain Statement control Control over southeastern territories Ukraine 's government started Process_start `` antiterrorist operation Military_operation '' ( ATO ) sending Sending armed forces to suppress separatists .