The Philippines says it plans to buy the U.S. Typhon missile system as part of a push to secure its maritime interests, sparking warnings from China of a regional "arms race."

China says a plan by the Philippines to deploy midrange missiles would be a provocative move that stokes regional tensions.

The Philippines' defence minister on Tuesday justified the country's deployment of a U.S. medium-range missile system and plans to acquire its own, despite opposition from China, a longstanding rival in the South China Sea.