Miracles happen. But so does good diplomacy. The release of WNBA star Brittney Griner is a huge moment for Griner and for America at a time when public confidence in government is low. Griner was detained in February at Moscow’s Sheremetyevo Airport, charged with possessing vape cannisters with cannabis oil. She faced years of difficult imprisonment in Russia, having recently been moved to a labor detention camp with harsh conditions. President Biden and his team deserve credit for negotiating a deal for the release of Griner in exchange for Russia arms dealer Viktor Bout, known as the “Merchant of Death.”...