Kapitan Pattimura-class (Parchim-class)

Developed during the late 1970s for the East German Navy, this class of coastal anti-submarine warfare vessels was intended to counter small coastal submarines in the event of a conflict between NATO and the Warsaw Pact. Following the reunification of Germany, the vessels saw brief service in the unified navy before the fleet was sold to Indonesia in 1993. The Indonesian Navy acquired sixteen of these ships, which were subsequently designated as the Kapitan Pattimura class.

Constructed with stainless steel and divided into ten waterproof compartments, these vessels were designed to operate beyond coastal waters even in adverse weather conditions. The propulsion system utilizes a three-shaft diesel configuration to manage cruising and boost speeds. The primary function of the platform is the detection and destruction of subsurface threats, utilizing a sonar suite that includes both bow-mounted and variable depth dipping sensors to penetrate varying water temperatures. Offensive capabilities against submarines consist of torpedo tubes and depth charge rocket launchers, supplemented by the capacity to lay mines. Defensive armament includes twin-barrel 57mm and 30mm guns, alongside man-portable air-defense positions. However, the reliance on outdated electromechanical systems and vacuum tubes in the fire control radar limits the vessel's effectiveness against modern anti-ship missiles, rendering it vulnerable to precision-guided weapons.

The Indonesian Navy extensively refurbished the fleet upon acquisition, replacing engines and installing air-conditioning systems. In operational service, these corvettes are primarily restricted to coastal or "brown water" operations due to their lack of a modern, radar-guided surface-to-air missile system. To operate in open sea environments, doctrine requires them to be escorted by vessels capable of providing an integrated air defense umbrella. While most of the original Indonesian hulls remain active, some have been decommissioned following damage from fire or collisions with shipwrecks. Modifications within the Indonesian fleet include the integration of Chinese-made close-in weapon systems, autocannons, and updated torpedo launchers on specific hulls. The class also remains in active service with the Russian Baltic Fleet.