are armed with the Aster 15 missile. The Aster missiles use the DCN SYLVER launcher. As with the La Fayette class the primary offensive weapon is the anti-surface Exocet missile. The ships' main gun is the Oto Melara 76 mm/62 Super Rapid gun replacing the 100 mm TR automatic gun. There are also four aft torpedo tubes. The ship is armed with the DCNS F17 heavyweight anti-submarine torpedo. The ships are capable of a maximum speed of with a maximum range of . Formidable class: Singapore The Republic of Singapore Navy's six s are of comparable size to the La Fayette class but differs from that class and the Saudi Al Riyadh class in the armament carried: in place of the Exocet is the Boeing Harpoon. The main gun is a stealth cupola equipped with an Oto Melara 76 mm gun replacing the 100 mm TR automatic gun. The Formidable class also uses the SYLVER launcher/Aster missile combination. The first ship, RSS Formidable, was built by DCN, while the remaining ships were constructed by Singapore Technologies Marine. Anti-submarine capability includes S-70B Seahawk helicopters. Maximum speed is , making it the fastest variant. The ships have a maximum range of . Kang Ding class: ROC (Taiwan) As the ROC (Taiwan)'s defensive stance is aimed towards the Taiwan Strait, the ROC Navy is constantly seeking to upgrade its anti-submarine warfare capabilities. The US$1.75 billion agreement with France in the early 1990s was an example of this procurement strategy: the six ships are configured for both ASW and surface attack. The Exocet was replaced by Taiwan-developed Hsiung Feng II anti-ship missile and the AAW weapon is the Sea Chaparral. The main gun is an Oto Melara 76 mm/62 mk 75 gun, similar to its Singaporean counterparts, the Formidable-class frigates. Some problems in the integration of Taiwanese and French systems had been reported. The frigate carries a single Sikorsky S-70C(M)-1/2 ASW helicopter. The Sea Chaparral SAM system is considered inadequate for defense against aircraft and anti-ship missiles, so the ROC (Taiwan) Navy plans to upgrade its air-defense capabilities with the indigenous Sky Sword II in 2020. The AMRAAM-class missiles will be quad-packed in a vertical launch system for future ROCN surface combatants, but a less-risky alternative arrangement of above-deck, fixed oblique launchers is seen as more likely for upgrading these French-built frigates. In 2021 it was reported that the Republic of China would upgrade