Iranian President Hassan Rouhani on Tuesday left Tehran for Turkmenistan for talks on bilateral and regional issues.Rouhani's visit came at the official invitation of Turkmen President Gurbanguly Berdimuhamedow. Before heading for Turkmenistan's capital Ashgabat, the Iranian President said that his country "attaches importance to the promotion of its ties with the neighbouring countries", Xinhua news agency reported.During the two-day visit, Rouhani will hold talks with Berdimuhamedow while the two countries' high-ranking delegations would hold meetings.Iran and Turkmenistan will also sign cooperation documents in the presence of the two leaders. On Wednesday, Rouhani will head for Baku, the capital of Azerbaijan, to hold talks with his Azeri counterpart Ilham Aliyev.Tehran and Baku are scheduled to sign several cooperation agreements after which the two Presidents will attend a joint press conference.An economic meeting would be held on Thursday to discuss the strengthening of cooperation among the two countries' state-run sectors and economic agents.