By Dmitry Antonov and Katya Golubkova MOSCOW (Reuters) – Russia has been a reliable energy supplier to Europe even at difficult times in relations, Kremlin spokesman Dmitry Peskov said on Monday, calling reports in British media that Moscow may cut supplies in case of sanctions “fake hysteria”. Russian energy supplies are in the spotlight as the United States and Europe both promised to impose new, much harsher sanctions on Moscow should it invade Ukraine. Russia, which seized Ukraine’s Crimea peninsula in 2014, has massed troops on the frontier. It denies plans to invade but has said it could…