The leaders of Russia and North Korea have struck an agreement on mutual assistance in the event of an attack by a third country, as part of an overarching partnership agreement between the two countries. The agreement on all-encompassing strategic cooperation signed by Russian President Vladimir Putin and North Korean leader Kim Jong Un in Pyongyang on Wednesday is intended to take cooperation between the two states to a new level. Kim described the agreement as “a huge treaty,” which he said ushers in a new era. Their cooperation on political, military, economic and other issues was peaceful…