(Bloomberg) -- German Foreign Minister Annalena Baerbock warned that uncertainty over gas supplies from Russia will pose a stiff test for European Union solidarity this winter.Most Read from BloombergRussia Privately Warns of Deep and Prolonged Economic DamageAmazon Closes, Abandons Plans for Dozens of US WarehousesWorld’s Deadliest Roads in Focus After Billionaire’s Fatal CrashNASA’s Artemis Rocket Is a Gigantic Waste of MoneyCalifornia Declares Grid Emergency as Odds of Blackouts RiseOfficials