Russian strikes hit the eastern Ukrainian city of Kharkiv late Tuesday, the regional governor said on Telegram, hours after a surprise visit by the German foreign minister together with her Ukrainian counterpart.

"Stay in the shelters. The occupiers are bombing again!" governor Oleg Synegubov warned on Telegram, adding a warehouse was hit but no casualties reported yet.

Russia has yet to respond to the attack in Kharkiv. 

(With input from AFP)