A sixth round of EU sanctions targeting Russian oil, Russian banks and Russian military officials entered into legal force on Friday after publication in the EU Official Journal. EU foreign policy chief Josep Borrell said on Twitter the package was “a big blow to Putin’s war chest,” referring to Russian President Vladimir Putin. The punitive measures on the Kremlin for invading Ukraine come into legal effect after long drawn-out negotiations to convince Hungary and other landlocked EU countries to agree to a partial ban on Russian oil. The package targets Russian oil delivered by sea and exemp…