Downing Street wants to ramp up the sanctions against Russia but that's not going to happen here tonight. The groundwork for new sanctions has not yet been done.
The UK government wants the European Union to look at new ways of targeting individuals close to President Putin and the defence, finance and energy sectors.
These are broadly the areas where sanctions are already in place. But are they working? The Russian economy has been hit, the Rouble is at its lowest point since 1998, shares are falling.
Government sources say the Russians have been more willing to negotiate since the latest round of sanctions. But they also admit that the sanctions have yet to change the situation on the ground and that's why more are needed.
Were the Russians -as Barack Obama claims - weighed down by sanctions, or where the Ukrainians looking to cut their losses?
The new president of the European Council could be "very important" for David Cameron.