About the SA-13 can be more interesting if the S-300.
But the S-300 probably will not soon be.
OSA is a substitution SAM "Thor", I wonder will the "Thor" or not.
thor right ? you thinking that access to tor is really easy lol? thor still under heavy national security of all of countries ! and why you think that you can Comparison sa-8 with thor ? access to c-300 pmu is very easier than thor or tor !