In north-west Russia, a senior politician from the Kremlin party United Russia has been seriously injured in a knife attack, according to the authorities. The 45-year-old governor of the Murmansk region, Andrey Chibis, had undergone surgery and was in a serious condition, said the doctor treating him. The suspected perpetrator was injured during his arrest by security forces and is also receiving medical assistance, the Russian Investigative Committee announced overnight. The background to the attack is being investigated. Assassinations of representatives of the power apparatus are rare in Ru…