Should the UN intervene in Zimbabwe?

Zimbabwe opposition leader Morgan Tsvangirai has pulled out of Friday's election, thereby handing power automatically to corrupt leader Robert Mugabe. He has also called on the UN to intervene and prevent further 'genocide' from blighting the nation.

Foreign Secretary David Miliband has been customarily scathing about Mugabe's regime ... yet has lacked the fervour of Lib Dem leader Nick Clegg who is calling for 'aggressive action.' Would this be the right approach? What do you think?