Syrian President Bashar al-Assad is in Iran Saturday to meet with President Mahmoud Ahmadinejad and top officials.
Iran's state-owned media report the leaders are expected to discuss instability in Iraq, the crisis in Lebanon and ways to strengthen bilateral ties.
State-run news agency IRNA says the Syrian president is also scheduled to meet with Iran's Supreme Leader Ayatollah Ali Khamenei during the two-day visit.
Syria and Iran are close regional allies. Washington accuses the two countries of fomenting tension in Iraq by allowing insurgents to enter Iraq and then aiding them.
Syria is a firm supporter of Iran's nuclear program, which the United States says is aimed at building atomic weapons. Iran says the program is solely for peaceful purposes.
Some information for this report was provided by AFP and Reuters.