A new modified “flying radar” plane A-50U or called “Mainstay” by NATO, has been shipped to Russian air force these days. Basically as I understand those planes, they are used like radars where there is no radar army has. So when a part of air force or navy is going somewhere they would probably like to have a powerful radar with them, capable on spotting the enemy units around or to use it for more targeting the attacks. Such planes were started being used in 1980s but since 2011 they get an upgraded version of the old plane which can conduct its functions digitally now.
Full album is here:
A New Scout Plane is Up