On 10 September 2015, H.E. Ambassador Sihasak paid a courtesy call on H.E. Mr. Shigeru Ishiba, Minister in charge of Vitalizing Local Economy in Japan. Ambassador Sihasak and Minister Ishiba exchanged views on common challenges of the two countries such as the issues of aging society and energy security. Both agreed that the two countries should cooperate in tackling these issues while Japan shares her best practices with Thailand.