I think it appears that China is the aggressor here.
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China today accused the US of militarising the South China Sea, just days after it was revealed Beijing had deployed surface-to-air missiles on an island in the hotly disputed area.
Chinese Foreign Ministry spokesman Hong Lei told reporters that patrols by US military aircraft and Navy vessels, along with joint exercises involving regional partners were the true reason why concerns were growing over peace and stability.
"The above actions have escalated tensions in the South China Sea, and that's the real militarisation of the South China Sea," Hong said.
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China accuses US of militarising South China Sea : World, News - India Today
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China today accused the US of militarising the South China Sea, just days after it was revealed Beijing had deployed surface-to-air missiles on an island in the hotly disputed area.
Chinese Foreign Ministry spokesman Hong Lei told reporters that patrols by US military aircraft and Navy vessels, along with joint exercises involving regional partners were the true reason why concerns were growing over peace and stability.
"The above actions have escalated tensions in the South China Sea, and that's the real militarisation of the South China Sea," Hong said.
...
China accuses US of militarising South China Sea : World, News - India Today