Among the many regional players operating on Syrian soil, two arch-enemies are familiar with each other’s war tactics: Hezbollah and Israel. After challenging Israel for nearly four decades in southern Lebanon, in recent years the Iranian-backed Hezbollah has sought to open a new battlefield in southern Syria. Tel Aviv is growing anxious and has been aggressively targeting any movement by the Lebanese group that could insinuate building or transferring military capabilities near the Israeli-occupied Golan Heights. Iran’s agility in moving weapons and fighters between Lebanon, Syria, and Iraq worries Israel and changes the rules of the game in the Levant. Here’s my latest policy analysis on the covert war between Israel and Hezbollah in Syria.