Commentary The Washington foreign policy establishment says that the hundreds of thousands of Russian troops on Ukraine’s border threaten NATO and European security. Maybe so, but it’s also possible the Russian forces deployed shortly after Joe Biden took office represent Moscow’s defensive posture. For all the theories the media and Beltway experts have advanced to explain the perhaps imminent Eastern European conflict, they’ve hidden one big piece of the puzzle—the political faction that Biden leads sees Ukraine as an instrument to advance its narrow partisan interests, foreign and domestic. In 2013, the Barack Obama administration saw a Ukrainian protest movement as an opportunity to topple a Kyiv government aligned with Moscow. A few short years later, Hillary Clinton’s presidential campaign used Ukrainian officials and activists to push an intelligence operation targeting her rival, Donald Trump. And in 2019, pro-Ukrainian U.S. policymakers conspired to impeach Trump in order to provide cover …