A Chinese fighter jet, armed with four air-to-air missiles, intercepted a US Navy P-8A Poseidon, coming in at just 500 feet(150 m) from the wing of the American plane over South China Sea. -WSJ
Update- The encounter which occurred today was over the north of Paracel Islands.
Transcript:
Chinese military ground station broadcast to the US Navy P-8 - "American aircraft, this is the PLA air force. You are approaching Chinese airspace. Keep a safe distance or you will be intercepted,”
The US Navy P-8 responded to the Chinese by saying it was flying in international airspace.
The Chinese ground station replied back - “No approaching any more or you will pay full responsibility.”