Explosions occurred in Kharkiv on the night of 5-6 April. There have been strikes near residential areas in the city. Source: Kharkiv Mayor Ihor Terekhov on Telegram; Oleh Syniehubov, Head of Kharkiv Oblast State Administration, on Telegram; Ukrainian Air Force Details: Terekhov said Kharkiv is under fire; explosions can be heard in the city.