Germany’s Friedrich Merz and Poland’s Donald Tusk are among a group of EU leaders urging Brussels to tighten visa rules for Russian nationals with combat experience in Ukraine. In a letter to European Council President António Costa and European Commission President Ursula von der Leyen, eight leaders warned that Moscow’s war on Ukraine is creating longer-term internal security risks for the EU’s Schengen free-movement area. They argue that demobilized or rotating combatants, including