Experts have warned the U.S. could be on the brink of a nuclear war after decades of simmering tension with Russia have exploded into an open conflict threatening millions of lives, RadarOnline.com can reveal.

The dire warning comes after President Donald Trump , 79, ordered the testing of U.S. nuclear weapons for the first time in 33-years as deranged despot Vladimir Putin , 73, assembles the world's largest nuclear stockpile, an estimated 5,580 warheads, which are believed to be aimed at major U.S. cities, including Washington D.C. , New York , Chicago , Houston , and Los Angeles . Article continues below advertisement

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"Because of other countries testing problems, I have instructed the Department of War to start tes

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