DAMASCUS, Syria — Iran and Syria condemned a U.S. plan to assist rebels fighting to topple President Bashar Assad on Saturday and signaled the Syrian leader intends to stay in power at least until 2014 presidential elections.

The remarks came against the backdrop of a strategic victory for the regime as the military regained control over a string of villages along a key highway to open a potential supply route in Syria’s heavily contested north.

The army command boasted of the achievement in a statement, saying it had eradicated the remnants of “terrorist agents and mercenaries” in the area that links the government-controlled central city of Hama with Aleppo’s international airport.

The reversal of gains, confirmed by Syrian activists, has the potential to change the outcome of the battle in Aleppo, Syria’s largest city where government troops and rebels have been locked in a stalemate for months.

Syrian rebels have long complained that they are hampered by the world’s failure to provide heavier arms to help them battle Assad’s better-equipped military. The international community is reluctant to send weapons partly because of fears they may fall into the hands of extremists who have been gaining influence among the rebels.

But U.S. Secretary of State John Kerry announced on Thursday that the Obama administration was giving an additional $60 million in assistance to Syria’s political opposition and would, for the first time, provide non-lethal aid directly to the rebels.