A little more than a year after the Russian effort to interfere in the American presidential election came to light, the diplomatic fallout — an unraveling of the relationship between Moscow and Washington on a scale not seen in decades — is taking its toll.

President Vladimir V. Putin bet that Donald J. Trump, who had spoken fondly of Russia and its authoritarian leader for years, would treat his nation as Mr. Putin has longed to have it treated by the West. That is, as the superpower it once was, or at least a major force to be reckoned with, from Syria to Europe, and boasting a military revived after two decades of neglect.

That bet has now backfired, spectacularly. If the sanctions overwhelmingly passed by Congress last week sent any message to Moscow, it was that Mr. Trump’s hands are now tied in dealing with Moscow, probably for years to come.

Just weeks after the two leaders spent hours in seemingly friendly conversation in Hamburg, Germany, the prospect of the kinds of deals Mr. Trump once mused about in interviews seems more distant than ever. Congress is not ready to forgive the annexation of Crimea, nor allow extensive reinvestment in Russian energy. The new sanctions were passed by a coalition of Democrats who blame Mr. Putin for contributing to Hillary Clinton’s defeat and Republicans fearful that their president misunderstands who he is dealing with in Moscow.