The United Arab Emirates released on Thursday a Lebanese physician after holding him for more than three weeks over a tweet he published years ago, a person familiar with the case said. The case of Dr. Richard Kharrat came to attention in early April when local media reported that he went missing from his hotel in the UAE capital of Abu Dhabi. The Ministry of Foreign Affairs in the UAE has declined to comment on Kharrat’s case since he was detained in early April during a visit to the oil-rich emirates. Days after Kharrat’s disappearance, Lebanon’s state news agency quoted Foreign Minister Abd…