Part of the Russian A-135 ballistic missile defense system, the 51T6 (Western reporting designation ABM-4 GORGON) is the upper-tier exoatmospheric interceptor. It may have an anti-satellite missile capability against targets in low earth orbit.
It has a nuclear warhead.
- ABM-4 may be system-level and SH-11 the missile proper
- "Gorgon (SH-11/ABM-4)", Missilethreat.com from the Claremont Institute