European Union leaders are likely to extend asset freezes and travel bans on key members of the Russian regime, as they meet in Brussels to discuss tougher sanctions in response to the annexation of Crimea.
In a pre-summit phone call last night, the Prime Minister and German Chancellor Angela Merkel agreed they would argue for the EU "building on" the travel bans and asset freezes agreed on Monday.
An unusually frank Nato Secretary General issued an unequivocal warning on the course of events should Russia attack Latvia or Estonia.
The West responds with sanctions and closer political ties with Ukraine as Russia's President seals the annexing of Crimea to much fanfare.
Supporters of the controversial fracking industry believe shale gas could be America's most potent weapon in the stand-off with Russia.