The fall of the last anti-Assad rebel enclave in the shattered city of Aleppo announced by both Russia and Syria on Dec. 13 brings to a bloody and ignominious close the failed U.S. policy of non-interventionism championed by Barack Obama and his Secretary of State, John Kerry.

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The failure of this idealistic "Obama Doctrine" of "peace above all" proves it's impossible for a superpower like the United States to withdraw from the dirty business of imposing its will on other nations, even if imposing its will meant using military force and sacrificing American lives.

Vladimir Putin took advantage of the knowledge Obama would never use military force to enforce U.S. foreign policy to quickly invade and seize Crimea in March 2014. He then proceeded to invade eastern Ukraine and was only stopped by U.S. and European sanctions and the plummeting price of oil.

China under Xi Jinping exploited Obama's weakness of trying to be a good guy in a world inhabited by ambitious and ruthless leaders to claim -- and enforce his claim -- that China owns the South China Sea.

Any form of U.S. military intervention in 2014 or 2015 will certainly have forced Xi to scale back his ambitions. Obama did nothing more threatening to Chinese hegemonism than launch a few freedom of navigation operation patrols by the U.S. Navy and overflights by its aircraft.

China continues to hold on to its militarized islands in the South China Sea convinced that Obama's penchant for peace meant he would let China have its own way. They were right.

And the fall of Aleppo after a Russian-led air campaign had committed unspeakable barbarisms, once again proved to Putin that Obama, the Peace Guy, would again do nothing more forceful than make angry but useless noises at him. Putin was right again.

Obama's decision not to use military force only convinced Putin he could use as much military force in Syria to win the Aleppo campaign, which it did. Russia was even so confident Obama would do nothing that it deployed its latest surface-to-air missile system (the S-300) to Syria to scare the Americans into not bombing Assad's army.

That ploy worked and the result was an unending massacre from the air of Aleppo's hapless civilians by Russian bombs and Assad's notorious barrel bombs.

The fall of Aleppo means idealism has no place in foreign policy.

Only the willingness to use force -- and to actually use that force -- will be respected by tyrants such as Putin and Xi that share the common aim of destroying the United States.

Both have come a long way towards achieving that aim by humiliating the effete Obama time and again.

The shared aim of Xi and Putin was detailed in a Chinatopix story last August that revealed Xi called on Putin to join China in forming a "New World Order" dominated by their countries. Xi expects to achieve this new world order in 10 years.

In a vitriolic speech delivered at the 95th anniversary of the founding of the Chinese Communist Party this July, Xi urged Putin to join China in a military alliance that will render NATO (the North Atlantic Treaty Organization) "powerless" and "put an end to the imperialist desires of the West."

"The world is on the verge of radical change," said Xi to his communist comrades. "We see how the European Union is gradually collapsing, as is the US economy -- it is all over for the new world order."

"So, it will never again be as it was before. In 10 years we will have a new world order in which the key will be the union of China and Russia," said Xi.

Donald Trump now has to prove all his macho blustering by fighting a war against Russia and China to restore the world's respect for American military strength that has guaranteed global prosperity and peace from a World War since the end of the last world war in 1945.

Obama has proven himself to be today's equivalent of Neville Chamberlain. And the United States' enemies are all the stronger for it.

TagsAleppo, Barack Obama, Obama Doctrine, Russia, china, Vladimir Putin, Xi Jinping