Soon after he rose to power 22 years ago, Russian President Vladimir Putin cracked down on the open antisemitism that nearly all of his predecessors had either encouraged, tolerated or ignored. Now, as Russia’s war effort in Ukraine founders, openly anti-Jewish rhetoric is entering the country’s mainstream media, with a popular talk show host naming Jews on air as being insufficiently patriotic and a think tank accusing a prominent Jewish philosopher of siding with Ukraine out of greed. The shift in rhetoric about Jews in Russian media began about two months ago, according to Roman Bronfman, a former Israeli lawmaker...