PYONGYANG, April 26 (CGTN) -- Democratic People's Republic of Korea (DPRK) leader Kim Jong Un, during his summit with Russian President Vladimir Putin, said peace and security on the Korean Peninsula will entirely depend on future U.S. attitude, state media Korean Central News Agency (KCNA) said on Friday.

Kim said at the time he will wait "until the end of this year" for the United States to become more flexible.

"The situation on the Korean Peninsula and the region is now at a standstill and has reached a critical point where it may return to its original state as the U.S. took a unilateral attitude in bad faith at the recent second DPRK-U.S. summit talks," KCNA reported Kim saying.

"The DPRK will gird itself for every possible situation," Kim added.

Kim invited Putin to the DPRK at a convenient time, and Putin accepted, KCNA said.

The first face-to-face talks between Putin and Kim, held on an island off the Russian Pacific city of Vladivostok on Thursday, did not appear to have yielded any major breakthrough.

Russia and the DPRK agreed to more closely promote mutual understanding and bonds, and boost strategic collaboration for ensuring regional peace and security, KCNA said.

Putin said afterward he thought a deal on Pyongyang's nuclear program was possible and that the way to get there was to move forward step by step in order to build trust.

But any U.S. guarantees might need to be supported by the other nations involved in previous six-way talks on the nuclear issue, Putin said.

Russia and the DPRK agreed to take measures to further cooperate in trade, economy, science and technology, KCNA said.