They're confident in their backing and feel invincible. Lebanon, a small coastal neighbor with sites from ancient judea. Expanding into the territory is probably on their timeline.

Israel is trying to create another six-day war. That's why they are trying to escalate it to neighboring countries. It's all a part of the Zionist land grab strategy. The current weakened state of Russia gives them an opportunity. Iran and Syria used to have a lot of military support from Russia. That may also be a reason for so much Israel receiving so much backing from the US.

Presumably, they want to drag USA into a broader regional war.