LONDON — When Russian soldiers crossed into Ukraine and seized Crimea in 2014, the Obama administration responded with a slate of economic penalties that ultimately imposed sanctions on hundreds of Russian officials and businesses and restricted investments and trade in the nation’s crucial finance, oil and military sectors.
Now, with Russian troops massing on Ukraine’s border, the White House national security adviser has declared that President Biden looked Russia’s president, Vladimir V. Putin, in the eye this week “and told him things we didn’t do in 2014 we are prepared to do now.”
Whether harsher measures would persuade Russia to stay out of Ukraine, however, is far from clear. Historically, economic sanctions have a decidedly mixed track record, with more failures than successes. And actions that would take the biggest bite out of the Russian economy — like trying to severely curb oil exports — would also be hard on America’s allies in Europe.