UK Prime Minister Boris Johnson is set to call for Nato unity amid growing tensions within the military bloc, APA reports citing BBC.
A summit to mark the founding of the 29-member defence alliance 70 years ago gets under way near London on December 3.
The gathering is overshadowed by a bitter row between France and Turkey, and a continuing debate over money.
Last month, French President Emmanuel Macron described Nato as "brain dead", saying alliance members were no longer co-operating on a range of key issues.
US President Donald Trump, who has repeatedly clashed with Nato's European members over the funding of the bloc, is among world leaders attending.
He arrived in the UK on Monday ahead of a reception to be hosted by the Queen at Buckingham Palace on Tuesday evening. Mr Trump is set to hold separate talks with the German and French leaders, and Nato's secretary-general.
Nato members pledge to come to the aid of one another should any of the allies come under attack.
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