The P-800 Oniks (Russian: П-800 Оникс, alternatively termed Yakhont (Яхонт) for export markets; "Oniks" is onyx, and "Yakhont" is ruby or sapphire in English) is a Russian (former Soviet) supersonic anti-ship cruise missile developed by NPO Mashinostroyeniya as a ramjet version of P-80 Zubr. Its GRAU designation is 3M55. Development reportedly started in 1983, and by 2001 allowed the launch of the missile from land, sea, air and submarine. The missile has the NATO reporting codename SS-N-26. It is reportedly a replacement for the P-270 Moskit, but possibly also for the P-700 Granit. The P-800 was reportedly used as the basis for the joint Russian-Indian supersonic missile the PJ-10 BrahMos.
Sergei Prikhodko, senior adviser to the Russia President, has said that Russia intends to deliver P-800 to Syria. However Syria lacks any aircraft that can launch this missile and any ability to track targets over the horizon for it, so will be limited to line of sight attacks from ships and ground platforms. Israel is more concerned that these missiles may be transferred to Hezbollah for a repeat of the INS Hanit incident.