In defence of higher defence spending

Open this photo in gallery: From left, U.S. President Joe Biden speaks at an event with G7 leaders next to Ukrainian President Volodymyr Zelensky and Prime Minister Justin Trudeau to announce a Joint Declaration of Support for Ukraine during the NATO Summit, in Vilnius, Lithuania, on July 12.Paul Ellis/AFP/Getty Images Lots of important milestones are arbitrary. A 10th wedding anniversary, a four-minute mile, or losing 20 pounds are all artificial, to an extent (a 4:01 mile is nothing to sneeze at, after all). But that doesn't mean they do not signify something important: Devotion to one's partner, athletic excellence, improving…