It is unlikely that Bashar Assad is interested in acquiring another military adversary at the moment. The myriad rebel factions plus Turkey are making life hard enough for the regime. So the instigator might well have been Iran — the only other party with the authority to undertake such a move. Why? One possibility is that Iran wants Hezbollah to tie down the Israelis and prevent a Western intervention to help the rebels. Another is that Iran really believes Assad won’t survive and wants to move his assets to a “safer location,” Lebanon.
If either is the Iranian strategy, it is a huge blunder. Israel has been known to cross borders when a security situation becomes untenable – Iraq in 1981 and Syria in 2007 for example. If this security situation rises to that level, the next movement that the IDF finds intolerable would likely produce a similar or stronger response. The Iranians must be worried.