(Bloomberg) -- Shares in defense companies jumped after Russia’s attack on Ukraine. They did again after the Israel-Hamas conflict started. Now another surge driven by Europe’s mission to boost military spending is raising questions over whether they’ve gone too far, too fast.Most Read from BloombergUS Slams Strikes on Russia Oil Refineries as Risk to Oil MarketsIran’s Better, Stealthier Drones Are Remaking Global WarfareBond Trader Places Record Futures Bet on Eve of Inflation DataTrumpism Is E