Russia's invasion of Ukraine is a major reason that US drivers are paying record prices for gasoline. But it's not the only cause of the spike. Numerous factors are pushing prices up, with regular gasoline hitting a record $4.87 a gallon Monday according to AAA's survey — up 25 cents a gallon in just the last week. Gas prices were already expected to breach the $4 a gallon mark for the first time since 2008, with or without shots fired in Eastern Europe or economic sanctions imposed on Russia. But now the national average is expected to hit $5 a...