Speaking at a news conference after the summit, Starmer said four points had been agreed:
to keep military aid flowing into Ukraine, and to keep increasing the economic pressure on Russia
that any lasting peace must ensure Ukraine's sovereignty and security and Ukraine must be present at any peace talks in the event of a peace deal,
to boost Ukraine's defensive capabilities to deter any future invasion to develop a "coalition of the willing" to defend a deal in Ukraine and to guarantee peace afterwards
Sir Keir also announced an additional 1.6bn ($2bn) of UK export finance to buy more than 5,000 air defence missiles. This comes on top of a 2.2bn loan to provide more military aid to Ukraine backed by profits from frozen Russian assets.
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"We have to learn from the mistakes of the past, we cannot accept a weak deal... which Russia can breach with ease, instead any deal must be backed by strength," he said.
The prime minister did not state which countries had agreed to join this coalition of the willing, but said that those who had committed would intensify planning now, with real urgency.
The UK, he said, would back its commitment with "boots on the ground, and planes in the air".
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Turkey has already said previously that they want their Troops to be first on the ground as Peacekeepers in Ukraine.