French President Emmanuel Macron's push to deploy troops to Ukraine could yet prove the first domino of an official NATO military presence in the war-torn country, even while Russia's grinding frontline assaults and nationwide bombing campaign continue. The French leader said in late February that "nothing was excluded" with regard to officially putting NATO boots on the ground in Ukraine, though his American and German allies were quick to explicitly, and repeatedly, exclude that possibility. Macron has subsequently maintained his position, even garnering backing from eastern NATO states. This week, the commander of the French ground forces said his troops...