Ahmad Yani (ex-NLD Van Speijk)

The Ahmad Yani-class frigates are former Royal Netherlands Navy Van Speijk-class frigates, based on the British Leander-class design. Six of these frigates were acquired by the Indonesian Navy between 1986 and 1990, undergoing various modernizations during their service.

Originally constructed in the 1960s to bolster the Royal Netherlands Navy's anti-submarine capabilities during the Cold War, the lead vessel of this class first entered service in 1967. Following its transfer and recommissioning into the Indonesian Navy in 1986, the frigate became a workhorse for regional security, frequently deploying for anti-piracy operations in the Malacca Strait and territorial patrols in the Natuna Sea. To extend their operational viability, the Indonesian Navy replaced the ships' original steam turbines with diesel engines in the early 2000s. Today, these vessels remain active as critical transition assets while Indonesia gradually procures modern replacement hulls.