Pyongyang, December 21 (KCNA) --Leader Kim Jong Il's revolutionary idea will be immortal in the hearts of all the revolutionaries.

This was said in a message of condolences sent to Kim Jong Un, vice-chairman of the Central Military Commission of the Workers' Party of Korea, by Humberto Vargas Carbonel, general secretary of the Central Committee of the People's Vanguard of Costa Rica, on Monday.

The message expressed the most profound condolences over the demise of Kim Jong Il.

It extended solidarity to Kim Jong Un and all the Korean people.