MUNICH — Prime Minister Benjamin Netanyahu of Israel, attending a security conference with international leaders in Munich, on Sunday showed what he said was part of an Iranian drone shot down by Israel and warned that he was ready to go to war if Tehran continued to entrench itself in Syria.

Netanyahu, directly addressing Iran’s foreign minister, Mohammad Javad Zarif, during his speech said: “Do you recognize this? You should. It’s yours. You can take back with you a message to the tyrants of Tehran: Do not test Israel’s resolve.’’

He said that if pushed, Israel would act “not only against Iranian proxies that are attacking us, but against Iran itself.’’

A few hours after Netanyahu’s speech Sunday, Zarif dismissed the Israeli leader’s warning as a “cartoonish circus.’’

He accused Netanyahu of deliberately escalating the situation with “almost daily incursions into Syrian airspace’’ at a time when he was under pressure at home.

The remarks came just more than a week after the Israeli military had engaged directly with Iranian forces in Syria, striking what Israel said were a number of Iranian targets after intercepting a drone that had penetrated its airspace, then losing an Israeli fighter jet under Syrian antiaircraft fire.

Israel has long warned about the risk of conflict as Iranian forces and their allies, including Hezbollah, the Lebanese militant group, have dug in on Syrian territory and approached the boundary with the Israeli-held portion of the Golan Heights.

Israel has carried out scores of airstrikes in Syria in recent years, focusing largely on what it says are advanced weapons stores or convoys of weapons meant for Hezbollah, and it has also reportedly hit Syrian government facilities involved in weapons development and an Iranian base under construction in Syria.

“I’ve made clear in word and deed that Israel has red lines it will enforce,’’ Netanyahu said Sunday. “Israel will continue to prevent Iran from establishing a permanent military presence in Syria. Israel will continue to act to prevent Iran from establishing another terror base from which to threaten Israel.’’

The Munich conference provided Netanyahu with a timely opportunity to appear on the world stage in his preferred role as Israel’s security czar and chief guardian against Iran, just days after Israeli police recommended that he be charged with bribery, fraud, and breach of trust in two corruption cases.

The prime minister, who denies all wrongdoing, has responded by lashing out at his and Israel’s enemies and generally conducting his prime ministerial business as usual.

Netanyahu has long criticized the nuclear deal that was negotiated between Iran and the world’s biggest powers under former president Barack Obama and has found an ally in President Trump, who has said he wants to scrap the pact.

On Sunday, Netanyahu used the conference venue in the Bavarian capital to draw an analogy between the Iran deal and the appeasement of Nazi Germany, associated with a treaty signed in Munich on the eve of World War II.

The Iran deal, he said, had “unleashed a dangerous Iranian tiger in our region and beyond.’’

‘‘Appeasement never works,’’ he said. ‘‘The war to prevent war is getting late — but it’s not too late.’’

He stopped short of equating Iran with Nazi Germany but drew many comparisons. “Let me be clear, Iran is not Nazi Germany,’’ he said. “There are many differences between the two,’’ he said, but, he noted, “there are also some striking similarities.’’

He pursued the analogy later in the afternoon, when he visited a memorial to Israeli athletes who were killed by Palestinian terrorists during the 1972 Munich Olympics.

“There is special meaning to the fact that we are standing at the place where 11 of our athletes were murdered just because they were Jews and Israelis,’’ Netanyahu said. “Millions were slaughtered here just because they were Jews.’’

Today, he said, “we have a state and this state has acted, and is acting today, against terrorism and those who would destroy us,’’ he said.

Former secretary of state John Kerry, who was instrumental in negotiating the nuclear accord, rejected Netanyahu’s criticism, calling his claim that the deal would enable Iran to develop an arsenal of nuclear weapons ‘‘just not accurate.’’