International relationsJapan seen as leading partner to foster cooperation through common valuesFrom left, U. K. Prime Minister Keir Starmer, Italian Prime Minister Giorgia Meloni, Japanese Prime Minister Sanae Takaichi, Canadian Prime Minister Mark Carney and French President Emmanuel Macron. Macron will meet Takaichi on March 31. (Nikkei montage)TOKYO -- A host of world leaders have visited Japan for summits with Prime Minister Sanae Takaichi since she took office last year, seeking cooperation to navigate U. S. President Donald Trump's disregard for traditional diplomacy while also looking to balance ties with China.