BRUSSELS -- Ukraine has stolen the battlefield initiative from Russia with its cross-border offensive into the Kursk region. But its Western backers have, for the most part, remained curiously silent about the surprise move. The move also appeared to surprise many of Ukraine’s supporters at NATO and the European Union. It’s unclear how extensively they were briefed ahead of the offensive, if at all, even though U.S. President Joe Biden insists that he’s been kept abreast of developments since. “I’ve spoken with my staff on a regular basis probably every four or five hours for the last six or eight...