The Republican nominee for president, Donald J. Trump, has chosen this week to unmask himself as a de facto agent of Russian President Vladimir Putin, a KGB-trained dictator who seeks to rebuild the Soviet empire by undermining the free nations of Europe, marginalizing NATO, and ending America’s reign as the world’s sole superpower.

I am not suggesting that Donald Trump is employed by Putin—though his campaign manager, Paul Manafort, was for many years on the payroll of the Putin-backed former president of Ukraine, Viktor Yanukovych. I am arguing that Trump’s understanding of America’s role in the world aligns with Russia’s geostrategic interests; that his critique of American democracy is in accord with the Kremlin’s critique of American democracy; and that he shares numerous ideological and dispositional proclivities with Putin—for one thing, an obsession with the sort of “strength” often associated with dictators. Trump is making it clear that, as president, he would allow Russia to advance its hegemonic interests across Europe and the Middle East. His election would immediately trigger a wave of global instability—much worse than anything we are seeing today—because America’s allies understand that Trump would likely dismantle the post-World War II U.S.-created international order. Many of these countries, feeling abandoned, would likely pursue nuclear weapons programs on their own, leading to a nightmare of proliferation.

Trump’s sympathy for Putin has not been a secret. Trump said he would “get along very well” with Putin, and he has pleased Putin by expressing a comprehensive lack of interest in the future of Ukraine, the domination of which is a core Putinist principle. The Trump movement also agrees with Putin that U.S. democracy is fatally flawed. A Trump adviser, Carter Page, recently denounced—to a Moscow audience—America’s “often-hypocritical focus on democratization, inequality, corruption and regime change.” Earlier this week, Trump’s operatives watered down the Republican Party’s national-security platform position on Ukraine, removing a promise to help the Ukrainians receive lethal aid in their battle to remain free of Russian control.