Ja Song Nam said in a letter, a copy of which was sent to The Associated Press, that the naval exercise was the largest "waged with general mobilisation of the nuclear strategic assets" after US President Donald Trump last month "made the most ferocious declaration of war in history by claiming to 'totally destroy' the DPRK." Those are the initials of the country's official name, the Democratic People's Republic of Korea.
The five-day naval drills with the South Korean navy came ahead of Trump's first official visit to Asia next month, which is likely to be overshadowed by tensions with North Korea over its escalating nuclear and ballistic missile programmes.
The US and South Korea regularly conduct joint military exercises that Pyongyang condemns as invasion rehearsals.
"What cannot be overlooked," the DPRK's Ja said, "is the fact that the US, not being contented with the joint military exercise on the Korean peninsula, is kicking up the racket of military pressure upon the DPRK on a worldwide scale and is becoming more undisguised in its attempt to introduce NATO and other armed forces of its followers into the Korean peninsula in case of emergency."
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"No other country in the world than the DPRK has ever been subjected to such an extreme and direct nuclear threat from the US for such a long time and witnessed on its door such nuclear war exercises which are the most vicious and ferocious in their scale, style, aim and essence," the ambassador said.
If the council ignores the DPRK request again, Ja said, it will demonstrate "more clearly" that the UN's most powerful body is only a "political tool" of the United States.
The DPRK ambassador, in a separate letter, reiterated a request for the secretary-general to organise an international forum of lawyers to clarify the legal basis of the Security Council's increasingly tough sanctions resolutions, imposed in response to its nuclear and ballistic missile tests.
In March, Ja said the UN Secretariat should not again respond with the "preposterous out-of-date sophistries" that it is up to the Security Council to determine what constitutes a threat to international peace and security.