On Sunday, leaders from across Europe and Canada gathered in London to discuss support for Ukraine and how to move forward. Ukrainian President Volodymyr Zelenskyy also attended.

However, Estonia, Latvia, and Lithuania were left out. A source told the UK's Sky News they were "very unhappy" about the situation.

Instead, Starmer held an online meeting with Estonian President Alar Karis, Latvian PM Evika Silina and Lithuanian President Gitanas Nauseda before the summit kicked off.

"Prime Minister Starmer began the conversation with an apology, promising that such a situation would not happen again," Asta Skaisgiryte, Nauseda's advisor, told Lithuanian public broadcaster LRT following the discussion.

"Nauseda expressed significant dissatisfaction over the lack of an invitation to London," she added.

The Baltics are among the top donors of military and humanitarian aid to Ukraine. All three spend far more than 2 percent of GDP on defense, surpassing NATO's target.

After the meeting, Starmer announced a four-point plan to work with Ukraine to end the war and defend the country from Russia, the BBC reported.

The UK, France and other countries will step up their efforts in a "coalition of the willing" and seek to involve the US in their support for Ukraine, he said on Sunday.

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