North Korea should be prohibited from importing oil from China and other countries as a means of encouraging negotiations with Washington, a visiting delegation of senior members of the U.S. Senate and House of Representatives suggested in Seoul on Tuesday.

Such measures, which could impact humanitarian conditions in North Korea, are necessary because of the risks posed by the accelerating nature of Pyongyang’s ballistic missile and nuclear weapons programs, the delegation said.

“North Korea’s trading partners must intensify and enact pressure to bring North Korea to the negotiating table: that starts with getting China to cut off the flow of