Reuters reports: A delegation of Iranian lawmakers arrived in Damascus on Wednesday in the build-up to a joint operation against insurgents in northwest Syria, and said U.S.-led efforts to fight rebels had failed.

The visit, led by the chairman of the Iranian parliament’s National Security and Foreign Policy Commission, Alaeddin Boroujerdi, came as Iranian troops prepared to bolster a Syrian army offensive that two senior officials told Reuters would target rebels in Aleppo.

The attack, which the officials said would be backed by Russian air strikes, underlined the growing involvement in the civil war of Syrian President Bashar al-Assad’s two main allies, which has alarmed a U.S.-led coalition opposed to the president that is bombing Islamic State militants.

“The international coalition led by America has failed in the fight against terrorism. The cooperation between Syria, Iraq, Iran and Russia has been positive and successful,” Boroujerdi was quoted as saying by Iran’s state broadcaster IRIB as he arrived at Damascus airport.

The delegation was due to meet Assad, said officials.

Iran has sent thousands of troops into Syria in recent days to bolster the planned ground offensive in Aleppo, the two officials told Reuters. [Continue reading…]