K-300P Bastion-P Coastal Defense System
The K-300P Bastion-P (NATO: SS-C-5 Stooge) is Russia's premier mobile coastal defense missile system, equipping Vietnam's coastal defense forces with a credible long-range anti-access capability in the South China Sea. The system fires the P-800 Oniks supersonic cruise missile at Mach 2.0–2.5 out to 300–450 km, placing virtually the entire South China Sea within range of Vietnamese coastal batteries. Vietnam operates two batteries — each with 4 transporter-erector-launchers (TELs). The Oniks flies a sea-skimming terminal approach of just 5–15 meters, severely stressing shipborne air defenses.

- P-800 Oniks missile reaches Mach 2.0–2.5 in terminal phase — extremely difficult to intercept
- Sea-skimming terminal approach at 5–15 m altitude challenges even modern CIWS
- 300–450 km range covers entire contested South China Sea zone from Vietnamese mainland
- Mobile TEL (wheeled) enables shoot-and-scoot tactics — very survivable against counter-battery
- Provides credible asymmetric deterrent against PLAN carrier battle groups
- Dependent on Russian supply chain for missile replenishment — growing challenge post-Ukraine war
- Seeker can be confused by advanced DECM and chaff
- Limited to anti-ship role — no land attack capability against hardened targets
- Finite missile inventory with uncertain replacement timeline
- Radar emissions during targeting can reveal position despite mobility
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