Baku, September 26, AZERTAC President of the Republic of Azerbaijan Ilham Aliyev has sent a letter of congratulations to President of Turkmenistan Gurbanguly Berdimuhammedov as his country celebrates Independence Day.“Azerbaijan-Turkmenistan relations are characterized by principles of mutual respect, trust and support. I believe that our interstate relations and cooperation will continue to develop and expand dynamically in accordance with the will of our peoples,” the Azerbaijani President said in his message.“On this remarkable day, I wish you, dear Gurbanguly Malikguliyevich, the best of health, success in your endeavours, and the brotherly people of Turkmenistan everlasting peace and prosperity,” President Ilham Aliyev added.