As far as Russia SAM systems go, might wanna look at how Georgia procured the BUK M1s from Ukraine.
"Analysts stipulated that Georgian Buk and Tor missile systems were responsible for downing four Russian aircraft—three Sukhoi Su-25s close air support aircraft and a Tupolev Tu-22M strategic bomber—in the 2008 South Ossetia war.
U.S. officials have said Georgia's SA-11 Buk-1M was certainly the cause of the Tu-22M's loss and contributed to the losses of the three Su-25s. According to some analysts, the loss of four aircraft is surprising and a heavy toll for Russia given the small size of Georgia's military. Some have also pointed out, that Russian electronic counter-measures systems were apparently unable to jam and suppress enemy SAMs in the conflict and that Russia was, surprisingly, unable to come up with effective countermeasures against missile systems it had designed.
These missile systems sold to Georgia by the Ukraine which were used to shoot down Russian Jets during the war, are believed to have been sold to Georgia illegally."
Sources:
Buk missile system - Wikipedia, the free encyclopedia
Ukrainian prosecutors confirm country helped Georgia during Ossetia war — RT
What can we say, warfare is all about deception