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Japanese Foreign Minister Koichiro Gemba has sent a congratulatory letter to Azerbaijani Foreign Minister Elmar Mammadyarov in connection with the 20th anniversary of diplomatic relations between Azerbaijan and Japan. As Trend news Agency reports the letter stressed importance for the high level of political and economic relations between the countries as well intention to cooperate in the framework of GUAM + Japan. Furthermore, the letter emphasized Azerbaijan’s role as Japan’s primary partner in the South Caucasus.