By Noah Barkin BERLIN (Reuters) - "If you break it, you own it," former U.S. Secretary of State Colin Powell warned President George W. Bush before his invasion of Iraq. Whether it will ever be fair to blame Angela Merkel for "breaking" Greece is debatable. Unlike her finance minister, Wolfgang Schaeuble, who sent abundant signals in recent months that he could accept a euro zone that does not include Greece, Merkel has been determined to avoid such an outcome, according to her closest advisers.