Tanks and armoured vehicles from a Shenyang military unit took part in the drills on the Chinese side, Hong Kong-based South China Morning Post reported.
The development comes in the wake of China toughening its stand on North Korea with Chinese President Xi Jinping saying that "nobody should be allowed to throw a region and even the whole world into chaos for selfish gains."
North Korea has threatened nuclear strikes against the US and South Korea, with reports that it has positioned two mobile missile launchers on the country's east coast.
Meanwhile, the Chinese Defence Ministry denied foreign media reports that there has been a build up by PLA on the border with North Korea.
"The reports are not true. China is paying close attention to the development of the current situation on the Korean Peninsula and has always been committed to safeguarding peace and stability in Northeast Asia," a ministry spokesman said.
Calling for dialogue to ease tensions, Chinese foreign ministry spokesperson Hong Lei said: "We want peace over war, alleviation over tension, dialogue over confrontation. China opposes any action that would undermine peace and stability on the peninsula."
"North Korea remains at the forefront of China's geopolitics. Japan and South Korea provide strategic support for the US' pivot to the Asia Pacific, and North Korea is their shield," it said.
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