Matsudaira then served as the first secretary at the Embassy of Japan in Washington, D.C. where his uncle Saburō Kurusu also worked.
[5] When asked about the offensiveness of the term "Jap" on a television program by John Wingate on 7 June 1957, Matsudaira reportedly replied, "Oh, I don't care.
"[6] Upon receiving a letter from Shosuke Sasaki about the topic on 5 July, Matsudaira asked one of his secretaries to write a reply.
[8] He then pledged cooperation with the Japanese American Citizens League (JACL) to help eliminate the term "Jap" from daily use.
Following Jarring's calls for suspending the activities of the UN in Lebanon, the Security Council held the debate until adjourning upon Matsudaira's suggestion.
[14] In 1962, regarding the Sino-Indian War, Matsudaira insisted on Japanese support for India while warning against Chinese expansionism.
On 9 November, when Matsudaira asked the Ministry of Foreign Affairs to give aid to India, Torao Ushiroku [ja], who directed the Asian Bureau at the time, gave a brief response, saying that "Indians inherently expect others to assist them, but they never show any appreciation.
[17] In 1951, Matsudaira sent his daughter, Tokiko, to live with the family of Murray Sprung in New York City while attending school.