Hezbollah Secretary-General Seyyed Hassan Nasrallah has defended the Lebanese resistance movement’s decision to fight foreign-backed militants in the Syrian border town of al-Qusayr.

Nasrallah made the remarks on Saturday during a ceremony marking the 13th anniversary of the withdrawal of Israeli troops from southern Lebanon, known as the Liberation Day.

The Hezbollah leader said if foreign-backed militants win the war on Syria, they will turn their weapons on Lebanon.

Nasrallah further pointed out that the extremist Salafist groups form the backbone of the unrest in Syria, adding that the US-backed armed groups are also a threat to all Lebanese communities.

The Syrian army pressed ahead to liberate al-Qusayr in Homs Province fully from the foreign-backed militants on Saturday, seizing al-Daba’a military airport north of the town.

The army also regained control of the Ba’ath Party headquarters in the strategic town that borders Lebanon, killing large numbers of foreign-backed militants. The government forces have inflicted losses on the militants and destroyed their weaponry and equipment.

Nasrallah said the ongoing war in Syria is part of an American project to change the balance of power in the region in favor of the Israeli regime.

He, however, promised victory against the Salafist groups in Syria.

"I say to all the honorable people, to the Mujahedeen, to the heroes: I have always promised you a victory and now I pledge to you a new one" in Syria, he said.

"We will continue along the road ... bear the responsibilities and the sacrifices. This battle is ours ... and I promise you victory," he said.

The leader of the resistance movement also dismissed accusations that Hezbollah is a sectarian movement.