Malaysia says Chinese jets neared airspace

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Malaysia's air force says 16 Chinese military transport planes have come close to violating Malaysian airspace after they were detected conducting "suspicious" activity over the South China Sea.

The air force said they were forced to scramble jets on Monday to conduct visual confirmation after the planes flew to within 60 nautical miles off the coast of Sarawak state of Malaysian Borneo.

The Chinese planes did not contact the regional air traffic controller despite being instructed several times, the air force said.

"This incident is a serious threat to national sovereignty and flight safety due to the air traffic density over the airways," it said in a statement.

China's embassy in Kuala Lumpur said the planes conducted routine flight training and "strictly abided by" international law without violating airspace of other countries.

"China and Malaysia are friendly neighbours, and China is willing to continue bilateral friendly consultations with Malaysia to jointly maintain regional peace and stability," a spokesperson said.

Malaysia's air force said the planes, comprising Ilyushin il-76 and Xian Y-20 strategic transporters, had travelled in an "in-trail" tactical formation at altitudes of between 23,000 and 27,000 feet.

China has been pushing an expansive claim over the South China Sea, through which about $US3 trillion ($A3.9 trillion) worth of ship-borne trade passes annually.

Brunei, Malaysia, the Philippines, Taiwan and Vietnam also have claims to various islands and features in the area and China's coastguard routinely warns foreign boats and aircraft to leave what it calls its territory.

Last year, a Chinese survey ship held a month-long standoff with a Malaysian oil exploration vessel within Malaysia's exclusive economic zone (EEZ).

The latest incident follows months of diplomatic protests by the Philippines over the presence of hundreds of Chinese fishing boats in its EEZ, which it says are manned by militia.

China has largely ignored the complaints.