North Korea on Tuesday condemned last week’s decision by the U.S. to seize the impounded DPRK-flagged Wise Honest ship, describing the move as a “complete denial” of the spirit of last year’s Singapore joint agreement by the two countries.

In a press statement issued by a spokesperson for the DPRK Ministry of Foreign Affairs (MFA), Pyongyang accused Washington of an “illegal and atrocious act of robbery” through its detention of the vessel.

The statement comes less than a week after the U.S. Department of Justice (DOJ) last Thursday filed a civil forfeiture action against the Wise Honest,