The Ukrainian President arrives at the White House Friday with a wish-list including Tomahawks—and he may get them, writes Tom Nagorski.

Tomahawk missiles, known for their precision and ability to fly more than 1,000 miles at low altitudes, have been a staple of U.S. military operations since the early 1990s. Their relatively low cost compared to piloted aircraft and proven combat record—over 2,