Israeli Defence Minister Yoav Gallant on Sunday vowed to "hit the enemy hard" after rocket fire from Lebanon, which it balmed on Hezbollah, killed 12 young people in the Israeli-annexed Golan Heights and again raised fears that the war in Gaza will spread. France 24's Kethevane Gorjestani takes a look at how likely a full-blown war between Israel and Hezbollah could be.