North Korea is celebrating the 80th anniversary of its ruling Workers' Party on Friday by organizing a huge parade in the capital Pyongyang with tens of thousands of troops to showcase its extensive arsenal of weapons.    It is also a chance for Pyongyang to shore up its relations with allies like China and Russia, who are sending high-level representatives to the event.  China's Premier Li Qiang is attending the parade, marking the highest-level visit to North Korea by a Chinese leader since