U.S. President Donald Trump in New York on Wednesday told the UN Security Council (UNSC) that sanctions against North Korea will stay in place until it denuclearizes and that prohibited ship-to-ship transfers “must stop immediately.”

The President made the comments while chairing the UNSC for a special meeting on non-proliferation and while praising diplomatic developments with North Korea, though stressing that the council must enforce existing resolutions in order to continue progress.

“We have detected that some nations are already violating these UN sanctions, this includes illegal ship-to-ship transfers, which must end immediately,” Trump said.

“The safety of the Korean