China is not happy.

It is going to pay a high price for the North Korea sanctions imposed by the United Nations.

The new sanctions will force China's close economic relationship it enjoys with North Korea to suffer.

Yet it will still go ahead to implement the resolutions for the sake of world peace.

The United Nations Security Council unanimously imposed new sanctions on North Korea on Saturday that could slash its $3 billion annual export revenue by a third.

According to Chinese Foreign Minister, Wang Yi, the new resolution showed China and the international community's opposition to North Korea's continued missile tests.

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"Owing to China's traditional economic ties with North Korea, it will mainly be China paying the price for implementing the resolution," a statement cited Wang as saying.

"But in order to protect the international non-proliferation system and regional peace and stability, China will as before fully and strictly properly implement the entire contents of the relevant resolution," Wang added.

China has repeatedly said it is committed to enforcing increasingly tough U.N. resolutions on North Korea, though it has also said what it terms "normal" trade and ordinary North Koreans should not be affected.

The latest U.N. resolution bans North Korean exports of coal, iron, iron ore, lead, lead ore and seafood.

It also prohibits countries from increasing the numbers of North Korean labourers currently working abroad, bans new joint ventures with North Korea and any new investment in current joint ventures.