sentences:  Azerbaijani diplomats also said the national interests of Azerbaijan did not allow for an open-border policy with Iran since political instability in Iran may trigger a huge influx of Iranian ethnic Azeris refugees to Azerbaijan and did not want the proposed Turkey-Azerbaijan Visa Free Regime to be reciprocal with Iran as well.Azerbaijan lifted visa requirements for Turkish citizens from 1 September 2019.In June 2010, Azerbaijan and Turkey have signed key agreement on a package of Shah Deniz gas issues in Istanbul.