On 20 July 2005, the Belgian government decided to buy two of the remaining six Dutch M-class frigates to replace the two remaining frigates of the "Wielingen" class ("Wielingen" and "Westdiep") currently still in service with the Belgian Navy, which in turn might be sold to Bulgaria. On 21 December 2005, the Dutch government sold "Karel Doorman" (F827) and "Willem Van Der Zaan" (F829) to Belgium. The two ships were sold for about 250 million Euros. These two M-class frigates entered service with the Belgian Navy where they were renamed "Leopold I" and "Louise-Marie". In October 2005, the "Wielingen"-class frigate "Wandelaar" was officially handed over to the Bulgarian Navy, which christened the ship as "Drăzki" ('The Bolds'). The remaining ships of the class were transferred to Bulgaria as well, after completing modernization in Belgium. A Tripartite-class minehunter, "Myosotis", which was renamed "Tsibar" was transferred to Bulgaria soon after.