China calls for constructive efforts to ease Korean tensions

China called on Monday for all countries to make constructive efforts to ease tension after North Korea said the latest U.N. sanctions against it are an act of war and tantamount to a complete economic blockade.The U.N. Security Council unanimously imposed new sanctions on North Korea on Friday for its recent intercontinental ballistic missile test, seeking to limit its access to refined petroleum products and crude oil and its earnings from workers abroad.The U.S.-drafted resolution also caps c