14 people were injured in explosion near a court house in the eastern Ukrainian city of Kharkiv Jan 19, which is treated as a "terrorist act" by Markiyan Lubkivsky, an adviser for the state security service SBU.
There have been dozens of small bombings across Ukraine, with the epicenters being Kharkiv, Odesa, Mariupol, and Kyiv in recent weeks.
Authorities and most Ukrainians are convinced that the attacks are directly linked to Russia.
The blast in Kharkiv comes as Ukrainian government troops and pro-Russian separatist fighters are battling for the control of the bitterly contested Donetsk airport in eastern Ukraine.
The Ukrainian military claims its troops have retaken almost all the areas of the ruined airport lost to separatists in recent weeks.
But a separatist leader, Aleksandr Zakharchenko, said that "all the Ukrainian Army's attempts to take the airport...have failed."