Paul Mason has a hunch:

Syriza’s economics people have been crystal clear: they will no longer deal with the Troika (the EU/ECB/IMF body that runs the austerity programme). They will deal as a sovereign country with each institution separately. They argue the Troika itself was illegal.

So there is a real possibility that, as Tsipras annuls austerity this week, the hawks in the ECB – centred on Germany – will threaten to pull the Emergency Lending Assistance that keeps Greek banks afloat.

Right now Syriza’s economics team are trying to mobilise political support to stop this – from Francois Hollande, Matteo Renzi and, I am told, George Osborne. We’ll see.

For now make no mistake: this is going to become about sovereignty and democracy and the soul of the Eurozone.

Yes the Syriza people like to sing the Italian left anthem Bandiera Rossa; but if you could see the young people’s faces as they sing the anthem of ELAS, the resistance movement that defeated the Wehrmacht in 1944, you would understand what drives leftism here.

Note that last paragraph.