The countries said America should not heap responsibility for the rogue state at their feet, following a series of provocative tweets from US president Donald Trump.
Russia’s foreign ministry dismissed claims the Kremlin was “indulging” despot Kim Jong-un and his controversial missile programme and lashed out at Washington.
The ministry said: “We view as groundless attempts undertaken by the US and a number of other countries to shift responsibility to Russia and China, almost blaming Moscow and Beijing for indulging the missile and nuclear ambitions of the DPRK.”
China also issued an angry rebuttal, claiming it was America who actually held responsibility for the crisis.
The country’s UN Ambassador Liu Jieyi said: “[The USA and North Korea] hold the primary responsibility to keep things moving, to start moving in the right direction, not China.
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“No matter how capable China is, China’s efforts will not yield practical results because it depends on the two principal parties.”
Last week Mr Trump tweeted his frustration at China over its North Korea policy.
He said: “I am very disappointed in China. Our foolish past leaders have allowed them to make hundreds of billions of dollars a year in trade, yet they do NOTHING for us with North Korea, just talk.
“We will no longer allow this to continue. China could easily solve this problem!”
It comes after vice president Mike Pence sent a warning to the Kremlin, warning the White House will “hold Russia accountable for its actions”.
He spoke as both states imposed sanctions and penalties on the other, with Russia ordering America to cut its diplomatic staff numbers in the country.
Speaking in Estonia, Mr Pence said: “Today we stand where East meets West — on a great frontier of freedom. No threat looms larger in the Baltic States than the spectre of aggression from your unpredictable neighbour to the east.
“Under President Donald Trump, the United States stands firmly behind our Article 5 pledge of mutual defence — an attack on one of us is an attack on us all.
“President Trump has made it clear: America is open to a better relationship. But the president and our Congress are unified in our message to Russia — a better relationship, and the lifting of sanctions, will require Russia to reverse the actions that caused sanctions to be imposed in the first place.”