By Steve Holland
STANSTED, England (Reuters) - U.S. President Joe&nbsp;Biden&nbsp;arrived in Britain on Sunday, starting a&nbsp;three-nation&nbsp;trip that will be dominated by a NATO summit in Lithuania aimed at showing solidarity with Ukraine in its fight against Russia while not yet accepting Kyiv as a member of the alliance.
But the challenges of forging solidarity among NATO's 31 member countries were highlighted in a call between&nbsp;Biden&nbsp;and Turkish President Tayyip Erdogan before the alliance summit in Lithuania this week, with Sweden's bid for membership in the Western alliance a continued point of contention.
Biden&nbsp;landed at Stansted Airport and boarded the Marine One helicopter for central&nbsp;London, where he will meet British Prime Minister Rishi Sunak at 10 Downing Street on Monday. He will later travel to Windsor Castle for a visit with King Charles.
The talks with the king, expected to include climate initiatives, will give&nbsp;Biden&nbsp;a greater sense of the man who succeeded his mother, Queen Elizabeth, after her death last September.
Biden&nbsp;had tea with the queen at Windsor in June 2021, and they discussed many of the same issues that remain a top priority today, like Russia and China.
Biden&nbsp;will travel on to Vilnius, Lithuania, on Monday night and hold talks with NATO leaders there on Tuesday and Wednesday.&nbsp;Biden&nbsp;and the NATO allies aim to show support for Ukraine and give Ukraine President Volodymyr Zelenskiy a sense of what will have to be done to gain NATO membership sometime in the future.
In a CNN interview previewing his trip,&nbsp;Biden&nbsp;urged caution for now on Ukraine's drive to join NATO, saying the alliance could get drawn into the war with Russia due to NATO's mutual defense pact.
"I don't think there is unanimity in NATO about whether or not to bring Ukraine into the NATO family now, at this moment, in the middle of a war,"&nbsp;Biden&nbsp;said.
Zelenskiy said an invitation for Ukraine to join NATO would send a message that the Western defense alliance is not afraid of Moscow. Ukraine should get clear security guarantees while it is not in NATO, and Zelenskiy said that would be one of his goals in Vilnius, in an interview broadcast on Sunday.
"I'll be there and I'll be doing whatever I can in order to, so to speak, expedite that solution, to have an agreement with our partners," Zelenskiy said on ABC's "This Week."
The NATO membership of Sweden, whose accession to the alliance has been blocked by both Hungary and Turkey, will be part of the agenda in Vilnius. New members must be approved by a unanimous vote of all existing NATO members.
Biden&nbsp;discussed Sweden's NATO bid on a call with Erdogan, and "conveyed his desire to welcome Sweden into NATO as soon as possible," the White House said in a statement on Sunday.
Erdogan told&nbsp;Biden&nbsp;that Sweden must do more to contain supporters of the Kurdistan Workers Party (PKK), which it considers a terrorist group and who continue to hold demonstrations in Sweden, Erdogan's office said.
'CONFIDENT' ALLIANCE
A centerpiece of&nbsp;Biden's visit to Lithuania will be a speech he will deliver at Vilnius University on Wednesday night.
White House&nbsp;national security adviser Jake Sullivan told reporters the speech will cover&nbsp;Biden's vision of "a strong, confident America flanked by strong, confident allies and partners taking on the significant challenges of our time, from Russia&rsquo;s aggression in Ukraine to the climate crisis."
One of&nbsp;Biden's objectives is to show Americans back home the importance of continuing support for Ukraine as he faces re-election. Some of his Republican rivals in the race for the November 2024 presidential election have voiced doubts about his strategy.
Solid majorities of Americans support providing weaponry to Ukraine to defend itself against Russia and believe that such aid demonstrates to China and other U.S. rivals a will to protect U.S. interests and allies, according to a Reuters/Ipsos survey late last month.
Some Democratic lawmakers on Sunday raised concerns about&nbsp;Biden's decision to send cluster munitions to Ukraine. The artillery shells release dozens of bomblets that cause destruction over wide areas and unexploded ordnance can pose hazards for decades.
Jake Sullivan, the White House&nbsp;national security adviser, told reporters on Sunday that Ukraine in written assurances said it would not use cluster bombs in Russia or in populated areas.
Biden's last&nbsp;stop&nbsp;will be in Helsinki for talks with the leaders of the newest NATO member, Finland, and to attend a summit of U.S. and Nordic leaders.
&nbsp;
(Reporting by Steve Holland; Editing by Franklin Paul, Andrea Ricci and Leslie Adler)

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Biden begins three-nation tour with stop in London