It’s been three years since Russia invaded Ukraine. Looking back can help investors figure out how to invest in the defense sector in the years ahead.

A somber reflection on the war in Ukraine as it enters its third year. Since Russia invaded on February 24, three years ago, the Department of Defense said the United States has been a major player in getting Ukraine the support it needs to keep fighting by investing nearly $66 billion into Ukraine's security on top of another $600 million in funding they received,