- Summary- Russia says air base targeted by Ukrainian drone- Says it shot the drone down, no aircraft damaged- Says three servicemen were killed by falling debris- No immediate comment from UkraineDec 26 (Reuters) - Russia said on Monday it had shot down a Ukrainian drone close to one of its air bases for long-range bombers deep inside its own territory and that three Russian air force personnel had been killed in the incident.The air base, one of two strategic bomber bases housing Russia's air-delivered nuclear capability, is located near the city of Saratov, about 730 km (450 miles) southeast of Moscow and hundreds of kilometres from the frontlines in Ukraine."A Ukrainian unmanned aerial vehicle (drone) was shot down at low altitude while approaching the Engels military airfield in the Saratov region," the defence ministry statement, published on Monday, said.Russia has 60 to 70 strategic bomber planes of two types - the Tu-95MS Bear and the Tu-160 Blackjack.If Ukraine could strike that far inside Russia, it may also be capable of hitting Moscow, they said on social media."