North Korea had planned to send a high-level delegation to Davos for the first time in 18 years, but the WEF announced yesterday that it was rescinding the invite, following the North's nuclear test last week.
In a letter sent to the WEF managing board, Pyongyang's permanent representative to the UN in Geneva voiced deep concern over such a "sudden and irresponsible" move.
"The behaviour of the forum is a very sinister act of defying the elementary impartiality and principles to be abided by an international body," the North's official KCNA news agency quoted the letter as saying.
The protest letter noted that the North's decision to attend this year - with Foreign Minister Ri Su-Yong leading the delegation - had been a response to repeated requests from the WEF.
Also Read
As a result, the decision to rescind the invite for an "unjustifiable political reason", was unwarranted and "unbecoming", it added.
"And it took advantage of the moves of some forces pursuing extreme hostile policy toward (North Korea)."
The North claimed it had tested a miniaturised hydrogen bomb, although Western experts said seismic data suggested the yield was far too low for a fully-fledged thermonuclear device.
It was still North Korea's fourth nuclear test since 2006, and further evidence of Pyongyang's intention to continue developing its nuclear weapons capability in the face of international censure.