The ASMP-A (Air Sol Moyenne Porte Ameliore) is a stand off ramjet supersonic nuclear missile. It is equiped with a 300 kt warhead and its range reaches 500 km when launched at high altitude. It cruises at mach 2 at low altitude (mach 3 at high altidude) which makes it very difficult to intercept.
Its developpement started in 1997 and the missile entered operational service on French Air Force Mirage 2000 N in 2009 and 1 year later on the Rafale F3 (both in the French Air Force and Navy).
Source : http://pics-aeronef.discutfree.com/