Kralj-class

The Kralj class, designated as the "King" class in English, consists of two missile boats operated by the Croatian Navy. Developed by the Brodarski institut in the 1980s for the Yugoslav Navy as a successor to the Končar class, the project was originally known as the Kobra class or Type 400. Development was suspended in 1989 but resumed in 1991. During the Croatian War of Independence, Croatian forces captured the first vessel while it was under construction at the Kraljevica Shipyard.

The design features an all-diesel propulsion system, departing from the CODAG (Combined Diesel and Gas) configuration used in the preceding Končar class. The hull is 8.5 meters longer than the Končar-class design to accommodate the integration of Swedish-made anti-ship missiles, marking the first time these weapons were included in the design specifications for vessels in regional service. Structural differences exist between the two units; the second ship, Kralj Dmitar Zvonimir, was built with a longer hull and a modified bridge compared to the first vessel.

The first ship, Kralj Petar Krešimir IV, was commissioned into the Croatian Navy in June 1992. The second vessel, Kralj Dmitar Zvonimir, was laid down in the 1990s and entered service in 2002. Both ships are named after historic Croatian kings. Plans for a third vessel were considered in 1999, but construction did not proceed due to budget constraints. As of 2009, both vessels of the class remain in active service.