VIENNA — For centuries, Europe has styled itself as a sanctuary — a continent where those pursued by political powers could find refuge behind the rule of law. Yet today, that ancient promise stands in question. The fate of Kyrylo Shevchenko, Ukraine’s former central banker, casts a long shadow over Austria and over Europe’s conscience. From Stewardship to Accusation In 2022, as Russia’s invasion of Ukraine convulsed the world, Shevchenko guided his nation’s monetary policy with steadiness that earned the praise of Western allies. But within months, the accolades gave way to accusations. After his sudden resignation that autumn, Kyiv…