KYIV, Dec 10 (Reuters) - All non-critical infrastructure in the Ukrainian port of Odesa was without power after Russia used Iranian-made drones to hit two energy facilities, leaving 1.5 million people without power, officials said on Saturday.Serhiy Bratchuk, spokesperson for Odesa's regional administration, said electricity for the city's population will be restored "in the coming days," while complete restoration of the networks may take two to three months.Bratchuk said an earlier Facebook post by the region's administration, advising some people to consider evacuating, was being investigated by Ukraine's security services as "an element of the hybrid war" by Russia.Ukraine's prosecutor general's office said two power facilities in Odesa region were hit by Shahed-136 drones.Britain's defence ministry said on Saturday that it believed Iran's military support for Russia was likely to increase in the coming months, including possible deliveries of ballistic missiles."