The exercises included the landing of amphibious craft just off the James Shoal, 80 kilometres off the Malaysian coast.More here.
The James Shoal is China's most southerly territorial claim.
It is among several disputed parts of the South China Sea, including the Spratly Islands, that the People's Republic says belong to Beijing.
Map is the famous "Nine-Dashed Line" or "Cow's Tongue" showing the extent of Chinese South China Sea territorial claims.
I placed the yellow oval to show James Shoal area.