It was one of many bombings Terrorism in the cities of Kharkiv and Odessa oblasts Security forces arrested Arrest four people after the attack Attack .

From the beginning Process_start of March 2014 , protests by pro-Russian and anti-government groups took place Process_start in the Donetsk and Luhansk oblasts of Ukraine , commonly collectively called Name_conferral the `` Donbass '' , in the aftermath of the 2014 Ukrainian revolution Change_of_leadership and the Euromaidan movement .

Protests Protest in Donetsk and Luhansk regions ( oblasts ) escalated Cause_change_of_position_on_a_scale into an armed pro-Russian separatist insurgency .