The US military says it was forced to bring down an Air Force drone in international waters on Tuesday after a Russian fighter jet struck its propeller while harassing the spy drone. The incident happened over the Black Sea, with US European Command issuing a statement that said two Russian Su-27 fighter jets "conducted an unsafe and unprofessional intercept," per the AP. Prior to the MQ-9 Reaper drone's propeller being struck, the Su-27s dumped fuel on it and flew in front it in "a reckless, environmentally unsound and unprofessional manner. This incident demonstrates a lack of competence in addition to being unsafe and unprofessional," per the statement.