A U.S. think tank has unveiled a North Korean missile base,... that it says.... has yet to be declared by the regime. <br />According to Beyond Parallel,... a project of the Center for Strategic and International Studies in Washington,... the Sino-ri missile operating base,... some 210 kilometers north of the Demilitarized Zone,... is one of the oldest of the 20 or so such bases undeclared by the North.<br />The report says the base houses a regiment-sized unit,... equipped with Nodong-1 medium-range ballistic missiles,... and could have also played a role in developing the KN-15 ballistic missile that was first tested in early 2017. <br />