A frigate is a type of warship. In different eras, the roles and capabilities of ships classified as frigates have varied somewhat.
The Armed Forces of Serbia and Montenegro included ground forces with internal and border troops, naval forces, air and air defense forces, and civil defense. Preceding the VSCG was the Yugoslav Army from the remnants of the Yugoslav People's Army (JNA), the military of SFR Yugoslavia. The state, then named Federal Republic of Yugoslavia, participated in the Yugoslav Wars with limited direct intervention of its own armed forces. Following the end of the Wars and the constitutional reforms of 2003 by which the state was renamed "Serbia and Montenegro", the military accordingly changed its name. The military was heavily involved in combating Albanian separatists during the Kosovo War and Preševo Valley conflict, and also engaged NATO airplanes during the 1999 NATO bombing of Yugoslavia.
The Croatian Navy is a branch of the Croatian Armed Forces. It was formed in 1991 from what Croatian forces managed to capture from the Yugoslav Navy during the breakup of Yugoslavia and Croatian War of Independence. In addition to mobile coastal missile launchers, today it operates 30 vessels, divided into the Navy Flotilla for traditional naval duties, and the Croatian Coast Guard. Five missile boats form Croatian fleet's main offensive capability.
Kralj Petar Krešimir IV is a Kralj-class missile boat in service with the Croatian Navy. It was laid down in 1990 at the Kraljevica Shipyard as the first ship in a new class being built for the Yugoslav Navy. As the Croatian War of Independence started gaining momentum, shipyard workers stalled the completion of the ship until the remaining Yugoslav forces retreated, preserving the ship for the Croatian Navy that was being formed.
The Yugoslav Navy, was the navy of Yugoslavia from 1945 to 1992. It was essentially a coastal defense force with the mission of preventing enemy landings along Yugoslavia's rugged 4,000-kilometer shoreline or coastal islands, and contesting an enemy blockade or control of the strategic Strait of Otranto.
The Koni class is the NATO reporting name for an anti-submarine warfare frigate built by the Soviet Union. They were known in the Soviet Union as Project 1159. 14 were built in Zelenodolsk shipyard between 1975 and 1988. They were originally intended to replace the older Riga-class frigates, but were instead chosen as a design for export to various friendly navies. The Koni I sub class were designed for European waters and the Koni II were made for warmer waters. One ship was retained by the Soviets in the Black Sea for training foreign crews. Only a few of these vessels remain in service today.
The Beograd class of destroyers consisted of three ships built for the Yugoslav Royal Navy in the late 1930s, a variant of the French Bourrasque class. Beograd was constructed in France and Zagreb and Ljubljana were built in the Kingdom of Yugoslavia. In January 1940, Ljubljana struck a reef off the port of Šibenik, and was still under repair when the German-led Axis invasion of Yugoslavia commenced in April 1941. During the invasion, Zagreb was scuttled to prevent its capture, and the other two ships were captured by the Italians. The Royal Italian Navy operated Beograd and Ljubljana as convoy escorts between Italy, the Aegean Sea, and North Africa, under the names Sebenico and Lubiana respectively. Lubiana was lost in the Gulf of Tunis in April 1943; Sebenico was seized by the Germans in September 1943 after the Italian surrender and was subsequently operated by the German Navy as TA43. There are conflicting reports about the fate of TA43, but it was lost in the final weeks of the war.
The Kotor class (Yugoslav designation: Veliki Patrolni Brod (VPB)) are a pair of light frigates built for the Yugoslav Navy during the 1980s at the Kraljevica Shipyard in SR Croatia.
The Royal Navy, commonly the Royal Yugoslav Navy, was the naval warfare service branch of the Kingdom of Yugoslavia. It was brought into existence in 1921, and initially consisted of a few former Austro-Hungarian Navy vessels surrendered at the conclusion of World War I and transferred to the new nation state under the terms of the Treaty of Saint-Germain-en-Laye. The only modern sea-going warships transferred to the new state were twelve steam-powered torpedo boats, although it did receive four capable river monitors for use on the Danube and other large rivers. Significant new acquisitions began in 1926 with a former German light cruiser, followed by the commissioning of two motor torpedo boats (MTBs) and a small submarine flotilla over the next few years. When the name of the state was changed to Yugoslavia in 1929, the name of its navy was changed to reflect this. In the late 1920s, several of the original vessels were discarded.
The Heroj class was a class of diesel-electric attack submarines built for the Yugoslav Navy during the 1960s. The three strong class was the second generation of domestically built submarines, representing a significant improvement compared to the earlier Sutjeska class. Built at the Brodogradilište specijalnih objekata in Split, the new class featured a streamlined hull design and four bow facing torpedo tubes that could also be used for minelaying.
The Končar class is a class of six missile boats built for the Yugoslav Navy during the late 1970s at Tito's Shipyard Kraljevica, SR Croatia. The boats featured a mixture of Western and Eastern European equipment, including Soviet anti-ship missiles and Swedish guns.
The Kralj class is a class of two missile boats, one of which was on order for the SFR Yugoslav Navy and one of which, following the break-up of Yugoslavia, was built for the Croatian Navy. As of 2009 both vessels remain in service. It is an upgraded version of the Rade Končar missile boat class and is 8.5 metres (28 ft) longer. Kralj Petar Krešimir IV and its sister ship Kralj Dmitar Zvonimir are the only ships in their class. A potential third ship was under consideration in 1999, but the ship was never commissioned due to budget restraints.
The Battle of the Dalmatian Channels was a three-day confrontation between three tactical groups of Yugoslav Navy ships and coastal artillery, and a detachment of naval commandos of the Croatian Navy fought on 14–16 November 1991 during the Croatian War of Independence. On 14 November, the commandos torpedoed the Mirna-class patrol boat PČ-176 Mukos close to the island of Brač in the Split Channel of the Adriatic Sea, prompting a Yugoslav naval bombardment of Brač and Šolta Island the same day. The drifting Mukos was salvaged by Croatian civilian boats and beached at Nečujam bay.
Zagreb was the second of three Beograd-class destroyers built for the Royal Yugoslav Navy (KM) in the late 1930s. She was designed to be deployed as part of a division led by the flotilla leader Dubrovnik and was the first warship built in the Kingdom of Yugoslavia. Zagreb entered service in August 1939, was armed with a main battery of four 120 mm (4.7 in) guns in single mounts, and had a top speed of 35 knots.
The Una-class submarine was a class of six midget submarines built for the Yugoslav Navy at the Brodogradilište specijalnih objekata during the 1980s. They were designed with the purpose of laying small minefields and transporting naval special forces, with or without their submersibles, in shallow waters that were inaccessible for larger submarines. Due to their mission profile that called for a small design as well as the need to stay undetected, they lacked torpedo armament and a generator for battery recharging.
Šibenik is a Končar-class missile boat in service with the Croatian Navy. It was built for the Yugoslav Navy at the Kraljevica Shipyard in the 1970s as Vlado Ćetković (RTOP-402). In 1991 during the early stages of the Croatian War of Independence it was captured by Croatian forces while being overhauled at the "Velimir Škorpik" shipyard in Šibenik.
Šolta is a Mirna-class patrol boat in service with the Croatian Navy. Completed during the 1980s as Mukos (PČ-176), it was the sixth ship of a class that was being built for the Yugoslav Navy in the Kraljevica Shipyard.
The Silba class is a class of three landing ships, also used as minelayers, built for the Yugoslav (JRM) and Croatian Navy (HRM) during the 1980s and 1990s. The ships were built at the Brodogradilište specijalnih objekata shipyard in Split with slight differences in armament configuration between the last two ships. By the time the Croatian War of Independence started, one ship was in service with the JRM while another was being completed.
The R-2 Mala is a class of swimmer delivery vehicles (SDVs) built for the Yugoslav, and later on, Croatian Navy. The two man wet SDVs are used for transporting naval commandos into hostile waters where they would perform sabotage on enemy warships and coastal installations. Weapons at their disposal included limpet mines.
Soviet Union 
SFR Yugoslavia 
FR Yugoslavia/Serbia and Montenegro 
