Russian President Vladimir Putin is to make a historic visit to North Korea, with the two sides likely to sign a “strategic partnership treaty.”

North Korea successfully test-fires a missile featuring a new navigation system and vows to further bolster its nuclear force as a deterrent against enemy aggression.

The North Korean leader oversees drills simulating a nuclear counterattack amid joint military exercises by the US and South Korea.

Sergei Naryshkin paid a visit to the peninsular country earlier this week to discuss security cooperation.

North Korea has fired “several” "strategic" cruise missiles, possibly nuclear-type, into the sea off the country's west coast, the fourth time in just over a week Pyongyang has launched such missiles.

North Korea has carried out a trial of its underwater nuclear weaponry system in a demonstration against the joint military exercises conducted this week by South Korea, the US, and Japan, which “seriously” threatened the “security” of Pyongyang.

North Korea’s leader, Kim Jong-un, calls for constitutional change to identify the south as “number one hostile state.”