The formation of Ukraine’s 155th army brigade was announced at the D-Day anniversary ceremony in Normandy last June, complete with photo-ops with the French president, Emmanuel Macron. Paid for, trained and equipped by France, it was a showcase of NATO support, the first of what Volodymyr Zelensky, Ukraine’s president, hoped would be 14 new brigades sponsored by Western allies. Its deployment six months later was a disaster.