The UK is said to be pressing for the closure of the SWIFT bank-clearance service, which would be a big move.
Ukraine's president accuses Russia of launching a "direct and open aggression" against the country after government forces suffered major reverses against the rebels.
Ukraine President Petro Poroshenko calls on the EU for an "adequate reaction", saying Russia has thousands of troops and hundreds of tanks in Ukraine.
President Putin seems confident as he says one thing and does another - denying Russian soldiers have crossed the border despite overwhelming evidence is classic Soviet doublespeak.
Russia continues to deny its soldiers are operating officially in Ukraine. Russian soldiers have been rushing to delete information on Instagram that may tell a different story.
Nato releases satellite imagery which it says shows well over 1,000 Russian combat soldiers operating inside Ukraine, armed with sophisticated weaponry.
The chimneys of Mariupol - where one the the biggest integrated steelworks in the world dominates the city skyline outside for miles - the new strategic significance in Ukraine.
Ukrainian President Petro Poroshenko promises to work on an urgent ceasefire plan with Russia's Vladimir Putin to defuse the separatist conflict in eastern Ukraine.
Ukrainian President Petro Poroshenko holds talks with his Russia counterpart, Vladimir Putin, at a summit in Minsk, capital of Belarus, as tensions continue to mount in eastern Ukraine.