The K-300P Bastion-P (NATO reporting name SS-C-5 Stooge) is a Russian mobile coastal defence missile system.

The main role of the Bastion-P is to engage surface ships including carrier battle groups, convoys, and landing craft.

They are fired vertically from the launchers using a solid-fuel rocket booster for initial acceleration, then use a liquid-fuel ramjet for sustained cruising at Mach 2.5.

[10][11] On 15 November 2016, Russia announced it had deployed K-300P Bastion-P systems to Syria, where it fired Oniks missiles at land targets[12] as part of the Russian military intervention in Syria, demonstrating a previously undisclosed land attack capability for the coastal defense system; the P-800 uses a combination of autopilot, INS, and a radio altimeter for mid-course guidance and a monopulse dual-mode active/passive seeker for terminal guidance.

Modified software in the Bastion's guidance system enables the missiles to dive onto stationary land targets, striking programmed coordinates.