Ronald Reagan strongly opposed communism and referred to the Soviet Union as the "evil empire." He implemented the Reagan Doctrine to support anti-communist freedom fighters around the world, including in Afghanistan, Angola, and Nicaragua. When the Soviet Union shot down a Korean Airlines flight that strayed into Soviet airspace, Reagan condemned it as an "act of barbarism." Reagan also ordered an invasion of Grenada to remove Cuban soldiers stationed there and justified it as a rescue mission of American medical students. Overall, Reagan took a hardline anti-communist stance and worked to "free the world from communism."