Three Russian servicemen were killed Monday after a Ukrainian drone was shot down by air defenses as it approached a military airfield in Saratov Oblast, deep inside Russian territory, according to Russian state news agencies, citing the defense ministry.It is the second such attempted attack on the city, which houses the Engels-2 military airfield, a strategic bomber airbase, this month.In comments Monday, Ukrainian Air Force spokesperson Yurii Ihnat did not claim direct responsibility for the drone, but did suggest the attack was the “consequence of what Russia is doing.”“If the Russians thought that the war would not affect anyone in the deep rear (of Russia) or anywhere else, they were deeply mistaken.“Therefore, we should be prepared for this, take it into account in our plans and do not forget to proceed to the shelter.”Earlier this month, CCTV footage appeared to show an explosion lighting up the sky in Engels.Busargin also reassured residents that no civilian infrastructure was damaged and that “information about incidents at military facilities is being checked by law enforcement agencies.”He had acknowledged that information about “a loud bang and a burst in Engels in the early morning” was spreading on social networks and the media."