Long-range missiles and heavy weaponry may be key to breaking the Russian military’s back in Ukraine, but is blackballing Vladimir Putin’s regime as a terrorist state also an essential step in bringing Vladimir Putin to heel? For months, Ukrainian President Volodomyr Zelenskyy has been urging the world to deepen Russia’s isolation by branding it with the “terrorist” designation, relegating it to the rogue-state ranks of North Korea, Iran and Syria. The United States Senate is on board, and has urged the State Department and the Biden administration to act. Five ex-Communist countries have done so as well. And the issue...