Biden's remarks on Russia should worry Ukraine

President Biden’s comments Wednesday regarding Russia’s intentions toward Ukraine are unlikely to reassure the government in Kyiv that the United States “has its back.” In a White House news conference, the president was unambiguous regarding a likely American and NATO response to a full-blown Russian invasion, but he indicated that the level of Russia’s aggression might determine the response. 

Russia no longer could do any business in dollars if it invades its neighbor, Biden said; it would be excluded from the SWIFT system for international funds transfer. He would subject Moscow to severe sanctions,...