28 February 1992
A few days after signing diplomatic agreements with Bulgaria, South African Foreign Minister Roelof "Pik" Botha signed an agreement with his Russian counterpart, Andrei Kozyrev, to establish full diplomatic relations between the two countries. The move was criticised by the South African Communist Party (SACP).  
References

Kalley, J.A.; Schoeman, E. & Andor, L.E. (eds)(1999). Southern African Political History: a chronology of key political events from independence to mid-1997, Westport: Greenwood.|Keesing's Record of World Events, News Digest for February, p. 38751.