The attacks came hours after brief direct talks failed to make any progress on steps to end nearly three-and-a-half years of war.

Ukrainian special forces destroyed Russian weaponry and personnel during a combat operation on the Tendra Spit, an island off the coast of the occupied area of Kherson Oblast, Ukraine's military intelligence agency (HUR) reported on July 29.

Ukraine says Russian missiles hit Mykolaiv, while Russia blames a huge oil blaze in Sochi on Ukrainian drones.