It is incumbent upon China and Russia to take responsible action by persistently convincing and pressuring North Korea to cease its unlawful pursuit of nuclear weapons and military provocation,' says S.

By Ju-min Park SEOUL (Reuters) -North Korean leader Kim Jong Un made a rare visit to Russia's embassy in Pyongyang with his daughter on Friday and reaffirmed "the invincible alliance" between the two countries,

The assessment came two days after North Korea confirmed for the first time that it had sent combat troops to help Russia recapture parts of the Kursk region.