Ooooof Russia is in a new diplomatic pickle here...
While Russia has been deeply involved in Syria for the better part of a decade plus the Israelis will likely be very upset that a country it has had a good relationship with allowed weapons like these to leak out.
Some of the weapons, which include modern Kornet antitank missiles manufactured as recently as 2020, were sent to southern Lebanon in recent years from Russian stockpiles in neighboring Syria, according to Syrian security officials and an Arab official.The weapons discoveries have also added to fears in Israel that Russia may be deepening its relationship with Hezbollah, despite Moscow’s longstanding assertions that it doesn’t take sides in conflicts between Israel and its neighbors.In addition to the Russian Kornets, the weapons included other Russian-guided antitank missile systems, including Metis, Konkurs, Fagots, and Saggers. All were found less than a kilometer inside southern Lebanon, above ground and underground in Hezbollah bunkers, an Israeli major who heads the disassembly lab said.Approximately 60% to 70% of the weapons seized in the initial days of Israel’s invasion were Russian, the Israeli major said. Since then, reservists who spoke to the Journal said they continue to find many Russian weapons inside Lebanon.
Given how Israel has stayed out of the Ukrainian invasions and Russia has more or less stayed out of the Gaza War this is going to change the equation significantly. Once Israel wraps up its Gaza/Lebanon War which I imagine will happen pretty quickly once Trump takes office (Iran's Supreme Leader has even told Hezbollah to agree to a ceasefire) they could "return the favor" to Ukraine. These weapon systems have been highlighted as what has caused a pretty significant number of Israeli solider casualties and that will not be something easily forgotten.