If you follow these things closely, you may have seen a clip of the chairman of the Munich Security Conference breaking down in tears, unable to speak any further while reflecting on Vice President Vance’s speech there. This breakdown is remarkable because the chairman, Christoph Heusgen, is not a minor apparatchik but a sophisticated and knowledgeable official who was Chancellor Merkel’s national security adviser from 2005 to 2017.

He had a front-row seat to Ms. Merkel’s epochal decisions — to shut down nuclear plants in 2011, admit 1 million Muslim male “refugees” in 2015, and hold defense spending far below the 2 percent level sought by the second Obama and first Trump administrations. His previous appearance on social media came when, as head of Germany’s United Nations delegation in 2018, he led his colleagues in laughing derisively at President Trump’s criticism of Germany’s reliance on Russian natural gas.

Mr. Heusgen’s tears were apt. Ms. Merkel’s policies, hailed by European elites at the time, now “lie in ruins,” writes the Economist.

Mr. Vance’s speeches at Munich and earlier at Paris criticized Europe generally and Germany in particular for stifling technological innovation, for suppressing speech, especially opposition to mass migration, and for spending well below NATO targets on defense. The European elites have had things their way and have led their societies on a path to decline.

All of which, the German journalist Wolfgang Munchau wrote, marked “the end of the transatlantic alliance.” Mr. Trump’s decision to conduct negotiations to end the Russia-Ukraine war with President Putin but not with Ukraine’s President Zelensky or any European leaders furthers that impression.

This is cause for regret for those with memories of the many dazzling successes of America’s trans-Atlantic alliance in response to Soviet aggression after World War II. America revived Western Europe’s war-torn economy with the Marshall Plan in 1948, deftly prevented possible communist victories in elections in Italy and France in 1948, kept West Berlin free with the airlift in 1948-49, and established the NATO alliance in 1949.

The result was a prosperous and free Western Europe in the next three decades — les trente glorieuses, in French — and the fall of the Soviet empire from 1989 to 1991. Peace has mostly prevailed in Europe for 80 years, almost as long as the 99 years of Metternich’s Congress of Europe and Bismarck’s balance of power between 1815 and 1914.

American postwar statesmanship was less successful in Asia. American leaders found it impossible to prevent the communist takeover of China in 1949, and 37,000 Americans died preventing one in South Korea from 1950 to 1953. Some 58,000 Americans died fighting alongside South Vietnam, which fell in 1975. In the meantime, Japan’s economy boomed, followed by similar growth in Korea, Free China, Hong Kong, and Singapore — and then, accelerating in the 1990s, in Communist China itself.

Today, we live in a world quite different economically from the one the builders of the trans-Atlantic alliance brought into being in the three postwar decades. As the Trump administration’s nominee for the No. 3 post in the Pentagon, Elbridge Colby, argues in his 2021 book “The Strategy of Denial,” America produces more than a fifth of the world economic product, Europe almost the same proportion, and Asia, including China and India, upward toward half.

And, as Mr. Vance noted last week, while America and China produce innovative technology, Europe, the fount of creativity from the 17th century to the early 20th century, now smothers it in overregulation. Europe’s criminal prosecutions of speech, including accurate reports of migrants’ criminal attacks and even of politically incorrect abortion statements made by citizens in their own houses, are repugnant to traditional American mores. And while Eastern Europe has increased defense spending in response to Russia’s threats, the large nations of Western Europe have been lagging.

The Trump administration foreign policy seems to be following Mr. Colby’s blueprint. His strategy seems to be to leave Europe to cabin in its hostile regional hegemonic power, Russia, and to leave Israel — with Abraham Accord bolstering — to deal with its hostile regional hegemon, Iran. That’s caused some Republicans, especially Senator Cotton, to voice doubts about his nomination.

Yet the strong negative reaction to the loss of 7,000 Americans in Iraq and 2,500 in Afghanistan made the Obama, Trump, and Biden administrations averse to sending any U.S. military forces into Ukraine, where casualties could be much higher, or against Iran after perceived failure in Iraq.

Moreover, Mr. Colby argues, America no longer has the defense capability of waging two or even one and a half wars simultaneously, and the development of relatively cheap defensive weapons, such as drones and hypersonic flights, may leave our relatively small number of very sophisticated and expensive aircraft carriers and fighter planes vulnerable to attack.

The central task of American foreign policy, this argument goes, should be to build our defense capabilities and increase our forward posture to make it clear to China’s leaders that they have no chance to seize Taiwan. This should build on previous steps to cooperate with regional allies, particularly Japan, India, and Australia. The amount of death and destruction that would be caused by any war in that region is unthinkable — or it would be if we did not have the history of the warfare between Japan and China from 1937 to 1945 to consult.

In the meantime, as in even the best years of the American-led trans-Atlantic partnership, there are some ugly things that need to be done. The failure of Ukraine’s offensive in 2023 and America’s unwillingness and Europe’s inability to send their own military forces or larger and more effective weapons to Ukraine in 2023 and 2024 have reduced the alternatives to continued violent war and morally unsatisfying peace.

You can lament, as I do, Mr. Vance’s cold indifference when, in February 2022, he said he doesn’t “really care what happens to Ukraine,” as well as Mr. Trump’s suggestion that Ukraine “started it.” You can look back at President Obama and Prime Minister Cameron’s failure, when Russia seized Crimea in 2014, to act on America and Britain’s guarantee to Ukraine in the 1994 Budapest Memorandum.

Yet given where things are now, do you have a better course in mind?

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