Monday's attacks damaged draft offices in the regional capitals of Kharkiv and Zaporizhzhia and came a day after a Russian drone struck a recruitment centre in the central Ukrainian city of Kremenchuk.

KYIV, Ukraine -- Russia targeted Ukraine overnight with 322 drones, 292 of which were "neutralized" by being either shot down or supressed by other means, according to the Ukrainian air force. Eleven people, including two children, were injured in the Kharkiv area, in a drone strike overnight there, according to local emergency services.

Officials say a Ukrainian drone has struck an industrial plant deep inside Russia, injuring several people and causing a fire.