RC-135! those things are old.
So is most of their technology.
The "luster" of the USSR days are long gone. Russia is simply a huge third world country. They have so many natural resources but the rubles from them will all go into the pockets of a few, wealthy families...perfect example of third-worldism.
Boeing 707 conversions.
Originally 1950’s vintage.
the airframes themselves are aging, but virtually every version in the fleet has undergone extensive upgrades, from electronics to operator stations and engines. Chances are that aircraft was an RC-135 V/W “RIVET JOINT” aircraft. If you’re interested, here’s a good link:
http://fas.org/irp/program/collect/rivet_joint.htm