Hanoi, June 19 -- Senior Vietnamese leaders on June 19 sent letters of congratulations to New Zealand leaders on the occasion of the 50th founding anniversary of Vietnam - New Zealand diplomatic relations (June 19, 1975 - 2025). State President Luong Cuong sent a letter of congratulations to New Zealand Governor-General Cindy Kiro, while Prime Minister Pham Minh Chinh sent a congratulatory letter to his New Zealand counterpart Christopher Luxon, and National Assembly Chairman Tran Thanh Man extended congratulations to Speaker of the New Zealand House of Representatives Gerry Brownlee. On this occasion, Deputy Prime Minister and Minister of Foreign Affairs Bui Thanh Son also sent a letter of congratulations to New Zealand's Minister of For...