The cautious EU position reflects divisions within the continent, but also the nature of a union created to prevent war and ease trade after centuries of conflict. The bloc reaches all of its decisions by painstaking consensus.
"America is one country and it can take steps, it does things in a slightly different way from the European Union. The European Union is 28 sovereign countries who have to agree together," British Prime Minister David Cameron said after an EU summit Thursday night.
Canada, home to more than 1 million people of Ukrainian descent, imposed its own travel bans Friday on people threatening Ukraine's territorial integrity. Canadian Prime Minister Stephen Harper said the ban was to protest Russian President Vladimir Putin's "illegal military occupation" of Crimea.