United States today announced sanctions on two North Korean officials for their roles in developing the country's ballistic missiles. <br/><br/>It is the latest step in a campaign to press Pyongyang to give up its nuclear and missile programs. US Treasury named the officials as Kim Jong Sik and Ri Pyong Chol. <br/><br/>It said Kim was reportedly a key figure in North Korea's efforts to switch its missile program from liquid to solid fuel, while Ri was reported to be a key official involved in the country's intercontinental ballistic missile development.<br/><br/>Treasury Secretary Steven Mnuchin said in a statement that the Treasury is targeting leaders of North Korea's ballistic missile programs, as part of its maximum pressure campaign to isolate North Korea and achieve a fully denuclearized Korean Peninsula. <br/><br/>The statement said these actions follow Friday's United Nations Security Council Resolution, which imposed strong new sanctions on North Korea further shutting down its ability to raise illicit funds.