She is the first member of Japan's royal family to visit Russia since 1916.
The greatest cheers were reserved for newly-married couple Prince Harry and his wife Meghan, who are appearing together at the historic meeting for the first time.
In a rare public and personal speech, the queen thanked all those who have sent letters and messages following the death earlier this month of her 33-year-old sister, Ines Zorreguieta.
King Maha Vajiralongkorn inherited one of the world's great fortunes when he ascended the Thai throne following the October 2016 death of his father, who ruled for seven decades.
The 50-year-old was sentenced on appeal to five years and 10 months in jail for embezzling millions of euros of public funds through the Noos Institute, a non-profit foundation he once chaired, to finance a lavish lifestyle.
The Duke of Cambridge is the first royal to make an official visit to Israel and the Palestinian territories on behalf of the British government, on a tour from June 24 to 28 that starts in Jordan.
The Duke and Duchess of Sussex, who were married at Windsor Castle last month, have timed their trip to coincide with the Invictus Games in Sydney in October.
They will not be taking a honeymoon immediately, as they are due to attend a charity garden party for Prince Charles, the heir to the throne, at Buckingham Palace on Tuesday.
Meghan Markle's father will not attend her wedding to Prince Harry this weekend, US media reported Monday, as Kensington Palace pleaded for "understanding and respect" for the couple during a "difficult situation".
Britain's Prince Harry and American actress Meghan Markle have asked a senior U.S. bishop to deliver the address at their wedding next Saturday.
Queen Elizabeth II marked her 92nd birthday on Saturday with traditional gun salutes and a Commonwealth-themed charity concert featuring Tom Jones, Kylie and Shaggy.
The German flag was incorrectly flown outside the residence of Governor General Julie Payette.
Meghan Markle attended the Commonwealth Day Service with four other members of the British royal family.
Born Henri Marie Jean Andre de Laborde de Monpezat in Talence, near Bordeaux, the count married Margrethe, heir to the Danish throne, in 1967.
Marina Mahathir says Islam's role affects everyone, not only Muslims.
With social media skills, younger royals are proving to be influential in Southeast Asia, while kings are beginning to show leadership where political leaderships have floundered, says report.
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