According to CNN, Israel is facing Iran-backed armed groups including Hezbollah. These are non-state organizations spread across regions in the Middle East including Yemen, Syria and Iraq.
Hezbollah is considered the world's most powerful non-state armed group and is based in Lebanon. Hezbollah has been fighting the Israeli army on Lebanon's southern border since October last year.
Hezbollah began to form since Israel's invasion of Beirut (Lebanon) in 1982.
Houthi forces from Yemen have focused their attacks on Israeli cargo ships passing through the Red Sea - a global trade artery.
In addition, the Iranian army also fought alongside Islamic militants in Syria against Israel.
Armed groups have begun to unite closely and form an axis of resistance against Israel since the war in the Gaza Strip began last October. They have continuously fought back strongly against Israel.
Hezbollah also claims the attacks on Israel are an act of support and defense for its ally Hamas. Cross-border clashes with Israel have increased following a series of electronic device explosions in Lebanon in mid-September.
One of the leaders of Hezbollah and other non-state armed groups has declared itself a supporter of the Palestinian people and has set out several conditions for ending hostilities in a ceasefire agreement in the Gaza Strip.
Although the military strength of Hezbollah or Houthi is completely different from Israel when standing alone, these forces will be a great threat to Israel when joining forces.
