WASHINGTON — The White House confirmed Monday that it gave Russia advance notice about President Biden’s surprise visit to Ukraine on Monday to avoid an accidental military clash between the two nuclear powers. “We did notify the Russians that President Biden would be traveling to Kyiv. We did so some hours before his departure for deconfliction purposes,” White House national security adviser Jake Sullivan told reporters on a conference call. “Because of the sensitive nature of those communications, I won’t get into how they responded or what the precise nature of our message was, but I can confirm that we...