The RS-28 Sarmat is said to be capable of destroying an area the size of Texas, and could evade missile defences with multiple hypersonic warheads.
Russian state media have claimed the missile has a range of 11,000km, a payload of 15 warheads, and the ability to “speed past every missile defence system in existence”.
The 100-plus ton ICBM will be tested in north-west Russia before the end of the year.
As North Korean dictator Kim Jong-un continues his aggressive missile testing campaign, as well as his exchange of insults and threats with President Donald Trump, tensions could now mount between Russia and the US too.
However questions have been raised about the validity of Russian state-sponsored media’s claims about the warheads.
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RIA claims the missile will have a “throw weight” of five tons – meaning the mass of all its components minus fuel and the launch rocket. But missile experts have questioned whether this is really possible.
Michael Kofman, of the Centre for Naval Analyses, said: “How do you fit a payload of 0 warheads and tons of decoys into five tons?
“There are large questions outstanding about conflicting claims about throw-weight, warheads and penetration aids.”
It comes as Kim Jong-un has claimed North Korea is now a “fully-fledged nuclear power” in a letter to governments including Indonesia and Australia.
The rogue dictator has undertaken six nuclear tests this year in a testing programme so aggressive it has threatened to destroy his own landscape.
He has also provoked both South Korea and the US with aggressive rhetoric, threatening to destroy both nations.
Meanwhile Washington has vowed Donald Trump’s military “will continue” to back its South Korean allies and maintain a strong stance against Kim Jong-un’s nuclear-armed north.