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“If China is not going to solve North Korea, we will.”

So President Donald Trump warns, amid reports North Korea, in its zeal to build an intercontinental ballistic missile to hit our West Coast, may test another atom bomb.

China shares a border with North Korea. We do not.

Why then is this our problem to “solve”? And why is North Korea building a rocket that can cross the Pacific and strike Seattle or Los Angeles?

Is Kim Jong Un mad?

No. He is targeting us because we have 28,500 troops on his border. If U.S. air, naval, missile and ground forces were not in and around Korea, and if we were not treaty-bound to fight alongside South Korea, there would be no reason for Kim to build rockets to threaten a distant superpower that could reduce his hermit kingdom to ashes.

While immensely beneficial to Seoul, is this U.S. guarantee to fight Korean War II, 64 years after the first wise? Russia, China and Japan retain the freedom to decide whether and how to react, should war break out. Why do we not?

Would it not be better for us if we, too, retained full freedom of action to decide how to respond, should the North attack?

During the August 2008 war between Russia and Georgia, despite John McCain’s channeling Patrick Henry—“We are all Georgians now!”—George W. Bush decided to take a pass on war. When a mob in Kiev overthrew the pro-Russian government, Vladimir Putin secured his Sebastopol naval base by annexing Crimea.

Had Georgia and Ukraine been in NATO, we would have been, in both cases, eyeball to eyeball with a nuclear-armed Russia.

Which brings us to the point:

The United States is in rising danger of being dragged into wars in half a dozen places, because we have committed ourselves to fight for scores of nations with little or no link to vital U.S. interests.

While our first president said in his Farewell Address that we might “trust to temporary alliances” in extraordinary emergencies, he added, “It is our true policy to steer clear of permanent alliances with any portion of the foreign world.”

Alliances, Washington believed, were transmission belts of war. Yet no nation in history has handed out so many war guarantees to so many “allies” on so many continents, as has the United States.

To honor commitments to the Baltic States, we have moved U.S. troops to the Russian border. To prevent China from annexing disputed rocks and reefs in the South and East China Seas, our Navy is prepared to go to war—to back the territorial claims of Tokyo and Manila.

Yet, our richest allies all spend less on defense than we, and all run trade surpluses at America’s expense.

Consider Germany. Last year, Berlin ran a $270 billion trade surplus and spent 1.2 percent of GDP on defense. The United States ran a $700 billion merchandise trade deficit and spent 3.6 percent of GDP on defense.

Angela Merkel puts Germany first. Let the Americans finance our defense, face down the Russians, and fight faraway wars, she is saying; Germany will capture the world’s markets, and America’s as well.

Japan and South Korea are of like mind. Neither spends nearly as much of GDP on defense as the USA. Yet, we defend both, and both run endless trade surpluses at our expense.