The congratulatory letter says: "On behalf of President Obama and the American people, I congratulate the citizens of Azerbaijan as you observe Republic Day on May 28.
For more than a quarter century, our two countries have worked together on behalf of security and prosperity in and beyond Europe. The United States strongly supports measures to increase economic opportunity and to ensure a peaceful and stable future for all Azerbaijan's citizens.
Azerbaijan plays a vital role as a supplier of energy to European markets, and the United States fully backs your efforts to increase regional energy diversification. My government values our partnership with you in the fight against violent extremism and our close collaboration on transnational issues. The United States also remains committed to facilitating a resolution to the Nagorno-Karabakh conflict".