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Alexis Tsipras is sworn in as Greek Prime Minister

26 January 2015 Last updated at 23:55 GMT

The far-left Syriza party, which won Greece's general election on Sunday, has formed an anti-austerity governing coalition with the right-wing party Greek Independents.

The coalition will have a comfortable majority in Greece's new parliament.

Syriza's leader Alexis Tsipras has promised to stand up to Brussels and renegotiate the terms of Greece's massive international bailout.

Gavin Hewitt reports.