(Reuters) -Two Russian missiles struck a residential area in the centre of Ukraine’s second city Kharkiv on Tuesday, injuring 17 people, two of them seriously, and badly damaging homes, local officials said. Rescue teams were sifting through piles of rubble to establish whether others were hurt. The city’s mayor described two “powerful explosions” and said at least 10 dwellings had been damaged. Ukraine’s Emergency Services, writing on the Telegram messaging app, said one of the missiles had hit a three-storey building that had previously housed a medical centre. Fires were extinguished in two…