Taiwan hopes to deploy at least two new, domestically developed submarines by 2027, and possibly equip later models with missiles, to strengthen deterrence against the Chinese Navy and protect key supply lines, the head of the program has said.

Taiwan, which China claims as its own territory, has made the indigenous sub program a key part of an ambitious project to modernize its armed forces as Beijing stages almost daily military exercises to assert its sovereignty.

President Tsai Ing-wen, who initiated the program when she took office in 2016, is expected to launch the first of eight new submarines on Thursday under a plan that has drawn on expertise and technology from several countries — a breakthrough for diplomatically isolated Taiwan.