North Korean leader Kim Jong Un has praised the legacy of the ruling party and called for renewed loyalty to socialism in a speech ahead of Friday's 80th anniversary of the founding of the Workers' Party of Korea, state media KCNA reported. Chinese Premier Li Qiang, a delegation from Russia's ruling party led by chairman Dmitry Medvedev as well as Vietnam's Communist Party chief To Lam, are among foreign dignitaries due to attend celebrations in the isolated state this week. Vietnam's government confirmed Lam and his delegation had departed for Pyongyang on Thursday for the first visit by a Vietnamese Communist Party leader to North Korea in nearly 20 years. Cooperation agreements were expected to be signed during the visit,...