SEOUL, May 14 — North Korea said today the seizure of one of its cargo ships by the United States was an illegal act that violated the spirit of a summit pact between the two countries' leaders, and demanded the return of the vessel without delay.

In a statement, the North's foreign ministry said it rejected UN Security Council resolutions against it, which the United States cited in impounding the vessel, as a violation of its sovereignty.

“This act is an extention of the US-style calculation of trying to hold us in submission with its 'maximum pressure' and is a total denial of the fundamental spirit of the June 12 DPRK-US joint statement,” an unnamed ministry spokesman said.

North Korea's formal name is the Democratic People's Republic of Korea (DPRK). The statement was carried by the North's official KCNA news agency.

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The United States is badly mistaken if it believed it can control the North with force, the ministry statement said, adding it will keep a sharp eye on future US behaviour.

The US Justice Department last week said it had seized a North Korean cargo ship that it accused of illicit coal shipments in violation of sanctions after it was first detained by Indonesia in April 2018.

North Korean leader Kim Jong-un and US President Donald Trump held an unprecedented summit on June 12 last year in Singapore and pledged to establish new relations and a peace regime on the Korean peninsula. They held a second summit in Vietnam in February which collapsed without agreement.

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US Justice Department officials said the North Korean vessel, known as the “Wise Honest,” was being impounded to American Samoa. The announcement came hours after the North fired two short-range missiles on Thursday.

The North Korean leader called for "full combat posture" following the US seizure of the North Korean cargo ship.

The test of two short-range missiles on Thursday and the firing of a series of projectiles on Saturday were the first missile launches by the North since an intercontinental ballistic missile (ICBM) in November 2017. — Reuters