Israel is prepared for a direct conflict with Iran if the threat of the regime’s terrorist proxies increases, Israeli Prime Minister Benjamin Netanyahu warned.

"We will act if necessary not just against Iran's proxies but against Iran itself,” Netanyahu said Sunday at the Munich Security Conference.

Netanyahu reinforced the point by showing the assembly of diplomats and international leaders a piece of the Iranian drone shot down after entering Israeli airspace eight days ago. Israel responded to the drone incursion with airstrikes against Iranian targets in Syria, but Syrian anti-aircraft defenses succeeded in downing an Israeli F-16.

"Israel will not allow the regime to put a noose of terror around our neck,” Netanyahu said.

Iranian Foreign Minister Javad Zarif countered the real lesson of the recent clash is the Israeli air force is vulnerable for the first time in decades. "And so the myth of invincibility of Israel, of the Israeli military, has crumbled,” Zarif told NBC News.

Zarif also brushed off Netanyahu’s warning. "Well, if they try to exercise that threat, they will see the response,” he said.

U.S. officials have worried for years about the prospect of a conflict between Israel and Iran that plays out across Lebanon and southern Syria.

Iran has transferred more than a hundred thousand missiles to Hezbollah, its terrorist proxy in Lebanon, some of which have precision-guided technology that could strike any place in Israel.

Netanyahu, additionally, has promised to prevent Iran from amassing on Israel’s border with Syria, where Syrian President Bashar Assad has invited Iranian forces to operate as they help his regime fight a civil war.

Netanyahu’s speech was designed not just to warn Iran, but also sway the United States and Europe as President Trump weighs whether to renew economic sanctions that former President Barack Obama waived under the Iran deal.

“[The speech] was meant to address the current aggressiveness of Iran on the ground and to influence what will happen in Washington in a few months,” Netanyahu told reporters, per the Times of Israel.