In a statement, Ri Thae-song, vice minister in charge of US affairs, also accused Washington of talking about dialogue aimed only at earning time without taking any corresponding measures to Pyongyang's denuclearization steps.
"The DPRK has done everything transparently and openly so far.
It feels no need to hide what it will do from now on and therefore, reminds the US once again that the year-end time limit comes nearer," according to the statement carried by the Korean Central News Agency.
DPRK stands for the North's official name, the Democratic People's Republic of Korea.
"The DPRK has done its utmost with maximum perseverance not to backtrack from the important steps it has taken on its own initiative. What is left to be done now is the US option and it is entirely up to the US what Christmas gift it will select to get," it added. (Yonhap)