PYONGYANG, March 24 (Xinhua) -- The permanent representative of the Democratic People's Republic of Korea (DPRK) at the United Nations has sent a letter to the UN chief regarding the situation on the Korean Peninsula, blaming the United States and South Korea for stoking tension there.

According to a report by the Korean Central News Agency (KCNA) on Thursday, the DPRK permanent representative to the UN said in the letter that the Korean Peninsula is on the brink of war due to the largest ever joint military drills being staged by the United States and South Korea.

The representative also recalled that on March 6, the DPRK urged the UN Security Council to hold an emergency meeting to discuss the issue of U.S.-South Korean joint military drills but has not yet received a response.

"The measures being undertaken to strengthen the national military power in our land, waters and air space are the regular self-defensive ones to safeguard the sovereignty of our country from the continuous nuclear threats and blackmails coming from the United States," said the representative.

The DPRK has fired four ballistic missiles and tested a rocket engine this month.