The BBC notes:

UK Prime Minister David Cameron tells journalists that the Nato summit has delivered a clear message that Russian actions in Ukraine are "indefensible and wrong".

He says new sanctions against Russia and plans to support Ukraine are being prepared.

Mr Cameron says the ceasefire in Ukraine is "good news". But he says he will have to look carefully to check it is backed up by a proper peace plan.

The UK prime minister adds that sanctions against Russia will go ahead.