http://www.airliners.net/photo/Russia-- ... M/2063929/
One of two with new Monitor equipment.
The three aircraft is mentioned as rebuilt around 2010 at Pushkin airbase, close to St Petersburg.
RA-75923 173 011 501 Il-20M with new Monitor equipment.
XX-XXXXX 175 011 706 Il-20M with new Monitor equipment.
RF-91819 176 011 708 Il-20M with new Anagram equipment.
The two types may bee is prototypes for new types of aircraft (such as Tu-214) or another research equipment.