the 2s7 soviet "peony" (pion) or "malka" is a soviet self-propelled gun, designated 2s7 inrussia's grau index. Identified in the west for the first time in 1975 it was therefore classified m1975 by nato (2s4 tyulpan/tulip also received the m1975 nato code), whereas the official designation is so-203 (2s7). The design is based on a t-80 chassis with the 2a44 203mm (8in) gun mounted towards the rear of the hull.

It carries four 203mm projectiles for immediate use with four more carried by a support vehicle. It is capable of firing nuclear ammunition of the same caliber. The gun has a range of 37,500 metres but the range can be extended to 55,500 metres by using rocket assisted projectiles (raps). Pion remains the most powerful conventional self-propelled artillery piece since entering service in 1983.