(Reuters) - Russia has focused its recent air attacks on the Ukrainian military-industrial complex although the threat to energy facilities remains high, a senior military spy official was quoted as saying on Monday by the RBC-Ukraine news site. Ukrainian officials have warned for months that Russia may target its energy system with missile and drone strikes for a second winter. Last year air strikes heavily damaged power facilities, causing blackouts for millions. Asked about a spate of major Russian air strikes since Dec. 29, Vadym Skibitsky, deputy head of Ukraine's military spy agency, sai...