North Korea opened an annual international trade fair Monday involving over 250 companies, amid toughened U.N. sanctions and growing calls in the United States to tighten the screws on its economy.The four-day event to run through Thursday, intended by North Korea to increase its trade with the outside world, has attracted about 80 foreign entities from 14 countries, including China, Indonesia and Vietnam, as well as Taiwan, to set up booths."The fair will create opportunities for the development of friendship and external economic relations," O Ryong Chol, a vice minister of external econo…READ FULL ARTICLE