On Saturday, leaders from 26 Western countries - plus two EU leaders and NATO's secretary general - gathered for a virtual call of the "coalition of the willing", hosted by Sir Keir after Volodymyr Zelenskyy accepted a 30-day interim ceasefire agreement.
Russia did not accept this ceasefire and has no reason to do so.
The prime minister said military chiefs would meet this Thursday to discuss the next "operational phase" in protecting Ukraine as part of a peacekeeping force - if a deal can be agreed with Russia.
Yeah Russia isn't going to be okay with this.
Russia has repeatedly said it would not accept soldiers from NATO countries being stationed in Ukraine.
So they know that Russia isn't going to be okay with this.
The spokesman also said he did not know if the US - notably absent from the coalition - will be joining the military chiefs' meeting on Thursday, but said the UK is having "regular discussions with our American counterparts".
Lol.