North Korean Ambassador to China Ri Ryong Nam called the United States a "common threat" to the two countries, adding that Pyongyang and Beijing should work together to respond to it, the Global Times reported Saturday.In an interview with the tabloid of the Chinese Communist Party, Ri criticized Washington for conducting military drills across East Asia, including those with South Korea.The United States has been aiming to "strengthen military ties with its allies and to put pressure on China," Ri said.Regarding the U.S.-South Korea military exercises that effectively started on Tuesday, R…READ FULL ARTICLE