Prime Minister of Sri Lanka, Dr. Harini Amarasuriya, participated in the 6th Bay of Bengal Initiative for Multi-Sectoral Technical and Economic Cooperation (BIMSTEC) Summit held in Bangkok, Thailand on 3–4 April 2025. The Summit, hosted under the theme of regional resilience and prosperity, brought together leaders of the seven BIMSTEC Member States to strengthen cooperation and chart a forward-looking agenda for the region.

Ambassador of Sri Lanka to Thailand, Wijayanthi Edirisinghe, met with the Director General of the Department of Business Development (DBD) under the Ministry of Commerce of Thailand, Auramon Supthaweethum, on 08th April 2025 to explore opportunities for deepening bilateral trade and business cooperation.