南部战区发声！

Group 1 - The core viewpoint of the article emphasizes the routine patrols conducted by the Southern Theater Command of the People's Liberation Army in the South China Sea from September 12 to 13, asserting China's commitment to safeguarding national sovereignty and regional stability [1] - The article highlights the Philippines' attempts to engage external forces for joint patrols, which are viewed as efforts to undermine peace and stability in the region [1] - The Southern Theater Command warns the Philippines to cease provocations and escalations in the South China Sea, indicating that any attempts to disrupt the situation will be futile [1]