An emboldened Russia has ramped up military offensives on two fronts in Ukraine. The renewed fighting has scattered Kyiv’s precious reserve troops and threatened to expand the fighting to a sixth Ukrainian region as each side seeks an advantage before the fighting season wanes in the autumn.

The last few weeks have seen massive waves of drones and missiles launched against Ukraine by Russia — attacks that are increasing in intensity.

Russia fired a total of 537 aerial weapons, including 477 drones and decoys and 60 missiles, in the "most massive airstrike" since the start of the war, Ukraine's air force said.