Advanced weapons include precise missiles, surface to air missiles and air defenses transported mostly via Damascus airport which has come under repeated strikes attributed to Israel
As the U.S. was supplying Israel with military aid, so is Iran delivering weapons to its regional allies, in transports through the Damascus airport mostly, while other weapons transports arrive through other locations.
The frequent strikes on Syria in recent days, attributed to Israel, were for the most part intended to thwart such transfers from Iran, that were meant to increase the number of precise missiles, anti-tank missiles and air defenses including the Iranian made surface to air 358 missiles also called SA-67) that can intercept drones, planes low flying aircraft and missiles, available to Hezbollah.
Iran had already supplied its Lebanese proxy with a substantial stock of missiles which have been used by Hezbollah against Israeli drones recently but have thus far failed to shoot any down. Israel has been able to intercept the 358 missiles using its air defenses.
The real root problem is Israel. During the Iran-Iraq war, they helped out Iran while the US helped out Iraq so that they could maximize the number of deaths. The US then fought Iraq for the sake of Israel, twice. The US also destroyed Libya, Syria, Somalia, etc for the sake of Israel. Countries like Egypt and Saudi Arabia think they’re clever in that they could curry favor with Israel, but after the other countries are destroyed, these idiots are next. So yeah, the real problem is Israel, it’s a cancer in the region and we’re seeing the rapid expansion of their “lebensraum” plan right now, with the excuse of “self defense” which only idiots are still buying at this point.