The Yugoslav navy operated ten Osa class missile boats and six "Končar" class missile boats. The Osa I boats were armed with four P-15 Termit surface-to-surface missile launchers. In 1990, ten domestic "Kobra" missile boats were scheduled to begin replacing the Osa I class. The "Kobra" class was to be armed with eight Swedish RBS-15 anti-ship missiles, and fifteen of them were ordered in late 1989. Armed with two P-15 Termit launchers, the "Končar" class boats were modeled after the Spica class torpedo boats, and there were plans to upgrade them with Swedish-built missiles. Two "Kobra" missile boats were built by Croatia as the and both are still in service. The navy's fifteen Topčider-class torpedo boats included four former Soviet Shershen-class and eleven Yugoslav built units.