Petya Class (Project 159 – Petya II and III variants) FFL light frigate LOA 268′ / 81.7 m TDISP 1,200 tons (5 active, service since 1983)
PAVN Petya II class frigate HQ-15 ca. 2017. Note the twin AA guns just forward of the rear turret. Credit: Hoangprs5, CC BY-SA 4.0,via Wikimedia Commons
PAVN Petya HQ-17 ca. 2016. Note the different armament of another set of torpedo tubes forward of the aft turret, and twin RBU ASW rockets forward of the bridge. Credit: Trinhvan21, CC BY-SA 4.0, via Wikimedia Commons