The U.S. should increase sanctions on North Korea following the lack of agreement at the recent Hanoi summit, General Vincent Brooks, former commander of U.S. Forces Korea, said at a Stanford University event on Friday.

But while doing so, Washington should develop an international economic plan that goes well beyond the scope of only inter-Korean exchange, to show North Korea there’s “serious potential for them if they move towards denuclearization”.

“The cost of achieving economic development has to go up as a result of Hanoi,” Brooks said, having proposed that Kim Jong Un’s participation in the second U.S.-DPRK summit showed