Steve Bassett, founder of the Paradigm Research Group (PRG), is one of the most senior UFO campaigners based in the US, and is the only registered lobbyist in the US on the "alien disclosure" subject.
Mr Bassett claims global governments are engaging with extraterrestrials on Earth and keeping it top secret from the public.
He believes there is more chance of Russian President Vladimir Putin speaking out than Donald Trump.
Mr Bassett spoke to Natalia Pryguina for Russian TV programme Most Shocking Hypotheses on Ren TV, one of the most watched networks in Russia with a viewer base of 120 million.
He has now released segments of the interview on the PRG website.
Mr Bassett said there was a wealth of testimony from witnesses about UFOs seen hovering over nuclear facilities in both the US and Russia.
And he revealed his thoughts on the main reasons "aliens are here."
He said: "Number one, nuclear weapons tampering. There is evidence all the way back to the sixties, but the media would not deal with it.
"The ETs come down and hover a craft over a nuclear site and turn all the missiles off.
"That was impossible. These are all individually siloed, they have individual support, you would literally have to affect each one separately.
"When a SAT-based officer or personnel try to turn them back on, they run through three sequences and as soon as they turn them back on, they are turned off again and they cant turn them back on until the craft leaves.
"This has been happening in the US, we have got scores of witnesses capable of testifying, SAT-based officers with top-security clearance."
He then detailed a more disturbing event said to have happened in Russia.
Old news. Robert Hastings documents all this in great detail in his important book "UFOs and Nukes." To read more, click here.