EUROPE - The biggest threat to the EU is the imminent collapse of Angela Merkel's fragile coalition, which would lead to a Europe-wide breakup "in an uncontrollable way" according to a leading left-wing and pro-EU commentator. The political instability that has rocked the German government could set in motion the breakup of the European Union, according to Paul Mason, a left-wing commentator. Angela Merkel faces a make-or-break week as German Chancellor, after leading figures in her sister party, the Christian Social Union, gave her a stark ultimatum. In an unprecedented challenge to Mrs Merkel's authority, the CSU will give Chancellor Angela Merkel a two-week deadline to meet its demands for overhauling asylum policy, according to German paper Bild.