Kim's visit to Moscow would have been his first trip abroad since assuming power in 2011.
Senior political figures and members of an orchestra reportedly executed in North Korean for anti-state activities.
The latest estimate claims that Pyongyang has been developing nuclear arms on an accelerated pace than previously thought.
International pariahs Kim and Putin will engage in bilateral talks ahead of event marking 70th anniversary of Soviet victory over Nazis.
North Korean leader Kim was accompanied by fighter pilots as he climbs Mt Paektu.
China invites Kim to attend massive military parade in September, which will mark the anniversary World War II.
North Korea's state media reported hundreds of foreign runners took part in an international marathon in Pyongyang.
Carter, on his first Asia tour since taking over, arrives in Seoul after visiting Japan.
South Korean activist flies copies of Seth Rogen's movie across the border
Pyongyang's moves come as US Secretary of Defence Ashton Carter is to visit South Korea.
Seoul says Pyongyang's missiles are 'provocative show of force' against ongoing military drills.
Much progress has been made in recent years but the veil of silence can still be difficult to penetrate.
Top North Korean diplomat extends invitation, as isolated countries strengthen ties.
Strong winds fan wildfire, which initially began on North Korean side of border, to South Korean side.
Pyongyang warns Korean People's Army will blow up propaganda balloons.
Pyongyang's envoy to London claims Kim Jong-Un's regime has technology to fire nuclear missile
South Korea says Pyongyang hackers staged a cyberattack to stir up 'social unrest and agitation'.
The Kremlin has tried to quash rumours that Putin is dead. Here are five reasons why not everyone believes it.
Seoul and Washington conclude computer-simulated Key Resolve joint military exercise.
Pyongyang intends to boost political and economic ties with Moscow in 2015.
When I saw our former Prime Minister Gordon Brown had said Britain outside the EU would be like North Korea, I felt sorry for the poor man.
The former prime minister also stressed that pro-Europeans should call for reforms in Brussels.