President Joe Biden and White House officials are seeking to clarify statements the president made Wednesday that suggest that a “minor incursion” from Russia against Ukraine would elicit a lesser response from the United States and its allies than a full-scale invasion of Ukraine would. Russia has amassed roughly 100,000 troops along its border with Ukraine and in Russian-annexed Crimea in recent weeks. While Western states say they are prepared for a Russian invasion of Ukraine, Russia denies it is planning an attack. But Moscow has demanded a promise from NATO to never admit Ukraine as a member. A series of high-level talks between the United States and Russia have yet to ease tensions. Biden and his administration have been clear both publicly and in talks with the Kremlin that any further invasion of Ukraine by Russia would result in “severe” sanctions by the United States and its allies. But …