Then Lebanon will be hit with the full force of the US carrier group that is now sitting off Cyprus.
It would be interesting if that carrier group is used against targets in Lebanon and indeed even in Syria against Iranian targets might the Iranians decide that some ballistic missile love and some long range drone love might be directed at the US Navy... enemy fighters would struggle against the US Navy but low radar cross section small drones and ballistic rockets might be a challenge for a US Navy carrier group.
Syria Air Defence is not terrible and includes BUK and Pantsir remember so even that aspect is going to be a challenge really.
As I mentioned before Syria has Bastion, which is Yakhont in a truck onshore... this wont be the turkey shoot it might once have been, and Russian S-300s have been replaced by Iranian equivalents too so enemy air power over Syria might not be so safe.