(CNN) Russia is ready to serve as a mediator between North Korea and the United States if both sides agree, Kremlin spokesman Dmitry Peskov told CNN on Tuesday.

"You can't become a mediator between two countries just on your own will. It is impossible, you need both sides to be willing," Peskov said.

Peskov's comments come just days after the UN Security Council unanimously adopted a new set of US-drafted sanctions on North Korea in response to Pyongyang's November 29 ballistic missile test.

The latest sanctions, aimed to further restrict energy supplies, tighten restrictions on smuggling and the use of North Korean workers overseas, are the toughest yet, according to US Ambassador to the UN Nikki Haley.

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