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The defense readiness condition, dubbed DEFCON, is an alert system used by the US military to indicate the risk of nuclear war.

The system has five levels of readiness, or states of alert, increasing in severity from DEFCON 5 – the least severe – to DEFCON 1 – the most severe.

Last month it was upgraded to level 3, meaning the US Air Force is ready to mobilise in just 15 minutes.

But following Trump’s Brexit-style election win, the DEFCON warning system website claims the threat been downgraded to level 5 – the safest grade.

In a statement on its website, it said that steps towards the normalisation of relations between Russian and the US have reduced the threat.

It read: “The United States took a tentative step toward a more isolationist policy with its recent presidential election.

"While it will take several months to see how the US reforms its foreign policy, already some world leaders have expressed hope that relations could improve, including Russia and Syria.

“If the new US President keeps to his previous statements, look for the United States to withdraw somewhat from military confrontations in the Middle East and possibly European theatre, though it is highly unlikely it will abandon NATO commitments, and the Ukraine will likely pop up again in the near future.

"Russia, however, will probably wait to see what the new President does, as well as now being hampered by the coming winter.”

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Bromance between Trump and Putin blossomed ahead of the US election on November 8.

The pair spoke for the first time last night when they vowed to join forces to smash ISIS in Syria.

DEFCON warning system believes China and North Korea now pose bigger nuclear threats.

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It added: “China and North Korea … continue to either cast a wary eye or are outright belligerent.

“Meanwhile, more troops are to be sent to Europe in 2017 to bolster defences against Russian movements and NATO continues building up forces in Poland and surrounding areas to protect against a potential Russian assault.”

The website stresses it is not affiliated with the US government or military and advises the public to “make their own evaluations”.