Like a bolt of lightning, that call of congratulations from Taiwan President Tsai Ing-wen to President-elect Donald Trump illuminated the Asian landscape.

We can see clearly now the profit and loss statement from more than three decades of accommodating and appeasing China, since Richard Nixon and Henry Kissinger made their historic journey in 1972.

What are the gains and losses?

Soon after Nixon announced the trip in July 1971, our World War II ally, the Republic of China on Taiwan, was expelled from the UN, its permanent seat on the Security Council given to the People’s Republic of China’s Chairman Mao.

In 1979, Jimmy Carter recognized the regime in Beijing, cut ties to Taipei and terminated the Sino-American Mutual Defense Treaty of 1954. All over the world countries followed our lead, shut down Taiwan’s embassies, and expelled her diplomats.

During the 1990s and into the new century, Republicans voted annually to grant Most Favored Nation trade status for China. They then voted to make it permanent and escort China into the WTO.

What did China get out of the new U.S. policy? Vast investment and $4 trillion in trade surpluses at America’s expense over 25 years.

From the backward country mired in the madness of the Great Proletarian Cultural Revolution in 1972, China grew by double-digits yearly to become the foremost manufacturing nation on earth, and has used its immense earnings from trade to make itself a military power to rival the United States.

Beijing has manipulated her currency, demanded transfers of U.S. technology, and stolen much of what of U.S. did not over.

During these same decades, some of us were asking insistently what we were getting in return.

Thus Trump’s phone call seemed the right signal to Beijing — while we recognize one China, we have millions of friends on Taiwan in whose future as a free people we retain an interest.

China bristled at Trump’s first communication between U.S. and Taiwanese leaders since 1979.

On Sunday, Vice President-elect Mike Pence assured us that nothing of significance should be read into the 15-minute phone call of congratulations.

According to The Washington Post, the phone call from Taiwan to Trump was no chance happening. It had been planned for weeks. And people in Trump’s inner circle are looking to closer ties to Taiwan and a tougher policy toward Beijing.

This suggests that Trump was aware there might be a sharp retort from Beijing, and that his tweets dismissing Chinese protests and doubling down on the Taiwan issue were both considered and deliberate.

On the trade front, China is deeply vulnerable. U.S. tariffs on Chinese goods would cause a sudden massive loss of income to factories in China and a stampede out of the country to elsewhere in Asia by companies now producing in the Middle Kingdom.

On the other hand, without China using its economic leverage over North Korea, it is unlikely any sanctions the U.S. and its allies can impose will persuade Kim Jong Un to halt his nuclear weapons program.

China can choke North Korea to death. But China can also step back and let Pyongyang become a nuclear weapons state, though that could mean Seoul and Tokyo following suit, which would be intolerable to Beijing.

Before we go down this road, President-elect Trump and his foreign policy team ought to think through just where it leads — and where it might end.