Recent moves by Washington and Brussels show diplomatic tracks heading in opposite directions with regard to Belarus, highlighting a growing divide between the allies on how to deal with Europe's security. On one side of the Atlantic Ocean, the United States is engaging Minsk and its authoritarian ruler, Aleksandr Lukashenko, by easing sanctions in exchange for the release of political prisoners, including 123 last weekend. That contrasts starkly with what's happening in Brussels, where European Union officials are still adding to their restrictive…