A unilateral ceasefire called for by Kiev is under pressure after pro-Russian separatists attacked an Ukrainian military base and posts on the border with Russia, government forces said.
The fresh attack came just hours after the start of a ceasefire at 10 p.m. on Friday by Ukrainian forces, ordered by President Petro Poroshenko as part of his plan to end the rebel insurgency in the east of the country.
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PM used a speech in Hamburg to say that the UK will not 'pull up the drawbridge and retreat from the world' but Europe must change.
It is set to remain unsettled into Saturday, becoming drier on Sunday.