The North Korean launch of two Nodong medium-range ballistic missiles “represent a troubling and provocative escalation”, the United States has said. “Coming on the heels of the DPRK’s March 3 and February 27 Scud launches, these March 26 launches of medium-range Nodong ballistic missiles represent a troubling and provocative escalation that the United States takes very seriously,” State Department Deputy Spokesperson Marie Harf said.