Russian overnight drone attacks on Ukraine focused on the north-eastern city of Kharkiv, continuing a pattern seen over recent weeks, Ukrainian authorities reported on Sunday. “Kharkiv is a danger zone. The city is coming under attack from Shahed drones,” city mayor Ihor Terekhov posted on Telegram shortly before midnight on Saturday. On Sunday, the Ukrainian air force reported that all 10 Russian drones over the Kharkiv region had been intercepted. The air attack had targeted critical infrastructure of the city, which lies some 40 kilometres south of the Russian border, Kharkiv Governor Oleh …