Re: Reasons are probably many
Sanctions never stopped the Russians in the days of Communism. The number of VAX'en and PDP's that popped out of the woodwork post 1989 was huge.
But they (sanctions) did enable the yanks to play dirty with their non-US resellers. Remember Systime: http://hansard.millbanksystems.com/commons/1986/feb/25/systime-plc