In Joint Stock Asset Management Company Ingosstrakh Investments v BNP Paribas SA (2012) EWCA Civ 644 the Court of Appeal has upheld an anti-suit injunction against a non-party to an arbitration clause on the grounds that Russian proceedings being pursued by that non-party were vexatious and oppressive.
Court of Appeal upholds anti-suit injunction against a non-party to an arbitration clause