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Amidst the solidification of the line between insurgent and government-controlled territory during the ceasefire, warlords took control of swaths of land on the insurgent side, leading to further destabilisation.
The ceasefire completely collapsed in January 2015, with renewed heavy fighting across the conflict zone, including at Donetsk International Airport and at Debaltseve.
Pro-Russian protesters occupied the Donetsk RSA from 1–6 March, before being removed by the Security Service of Ukraine (SBU).
Concurrent to the events in Donetsk, armed forces led by Russian operative Igor Girkin stormed and occupied government buildings in other regional centers beginning on 12 April.
Unrest in Luhansk Oblast began on 6 April, when approximately 1,000 activists seized and occupied the SBU building in the city of Luhansk, following similar occupations in the cities of Donetsk and Kharkiv.
The militants gained control of the city's police weapons cache and seized hundreds of firearms, which prompted the Ukrainian government to launch a "counter-terrorism" operation to retake the city.
The fighters, members of the Donbass People's Militia, later captured the police station.
Involved parties agreed to a new ceasefire, called Minsk II, on 12 February 2015.