Hezbollah on Monday said Lebanon would continue to stand by Syria and Iran against "international conspiracies" and "threats", as global pressure mounts on the two countries.
"The current events in Syria are clearly an international conspiracy against Syria's support for Arab and Islamic resistance movements in the region," the Iran- and Syria-backed group said in a joint statement with its Shiite ally, the Amal Movement.
The statement comes amid renewed international pressure on Syria's Bashar al-Assad over his brutal crackdown on an eight-month popular revolt.
Hezbollah and Amal also reiterated their support for Iran, as pressure mounts on the Islamic state over its nuclear programme.
"We firmly support the Islamic Republic of Iran against all American and Israeli threats," the statement said.
Hezbollah, blacklisted as a terrorist organisation by the United States, earlier this month accused Washington of ramping up pressure on Iran and Syria as a way to deflect attention from its "searing defeat" in Iraq.
The United States for its part has urged Lebanese authorities to protect their financial sector against potential Syrian attempts to sidestep sanctions, sparking fears that Beirut could be in the lineup of possible future measures against the Assad regime.