Answer : 2. "landing ship"
Explanation :

China demanded the removal of the Sierra Madre ship, which was rejected by the Philippines. Commissioned in 1944 for World War II, it served in Vietnam before being transferred to the Philippines in 1976. It was deliberately deployed in 1999 at Second Thomas Shoal, part of the disputed Spratly Islands, to strengthen territorial claims. Supply boats in the area are threatened by Chinese ships and water cannons. The removal risks weakening Philippines' claims and increasing Chinese presence.