Israel has opened a new front in its attempts to halt weapons smuggling to Hezbollah, striking one of the group’s positions inside Lebanon for the first time since the sides fought a war eight years ago.

This week’s airstrike, meant to prevent the Islamic militant group from obtaining sophisticated missiles, is part of a risky policy that could easily backfire by triggering retaliation.

But at a time when the Syrian opposition says Hezbollah has struck a major blow for President Bashar Assad’s government in neighboring Syria by ambushing al-Qaida-linked fighters there, it shows the strategic importance for Israel of trying to break the Syria-Hezbollah axis.

For now, the odds of a direct conflagration between Israel and Hezbollah appear low.

The group has sent hundreds of fighters to Syria and is preoccupied with saving Assad’s embattled regime.

Syrian state media reported that army troops killed 175 rebels, many of them al-Qaida-linked fighters, near Damascus on Wednesday, but the Britain-based Syrian Observatory for Human Rights, a prominent opposition group, said it was Hezbollah forces that carried out the dawn ambush.

Israel considers both Hezbollah and the al-Qaida-linked Nusra Front to be grave threats. With a lack of good choices, Israel has avoided taking sides in the Syrian war, and in the short term, is content watching the two sides beat each other up.

But in the long run, officials have expressed concerns about the battlefield expertise that Hezbollah has gained.

Officials also suspect that despite repeated Israeli airstrikes on suspected arms shipments, Hezbollah has managed to get its hands on many sophisticated weapons, including Russian-made anti-aircraft and anti-ship missiles, ensuring that any future conflict with Israel will be far more intense than previous rounds of fighting.

“The type of scenario we have to plan for is extremely robust,” said an Israeli military official, speaking on condition of anonymity because he was discussing an intelligence assessment. “It means the Israeli operational response has to be forceful, swift and decisive.”

Israel and Hezbollah, an Iranian-backed Shiite group committed to Israel’s destruction, battled to a stalemate during a monthlong war in the summer of 2006. Both sides have avoided any direct confrontation since a U.N.-brokered cease-fire ended the fighting, but each has been gearing up for renewed clashes.

Hezbollah rained some 4,000 rockets and missiles on Israel in 2006, mostly short-range, unguided projectiles. Israel believes the group now possesses 100,000 rockets and missiles. These include weapons with longer ranges, guidance systems and larger warheads, are capable of striking anywhere in Israel. The weapons come from Syria and Iran.

“Iran is handing out torches to the pyromaniacs,” Israel’s military chief, Lt. Gen. Benny Gantz, said during a tour of the northern front this week. “I suggest that everyone keeps in mind that underneath this quiet, a storm is brewing.”

Israel believes Hezbollah has used the fighting in Syria as cover to transfer weapons back to Lebanon.

Israeli leaders have repeatedly vowed to prevent Hezbollah from obtaining “game changing” weapons that could alter the current balance of power, and over the past year Israel has carried out a series of covert airstrikes in Syria that targeted shipments of weapons believed to be bound for Hezbollah. These included Russian-made anti-aircraft and surface-to-sea missiles, as well as advanced Iranian guided missiles.

Neither Israel nor Syria nor Hezbollah had confirmed any of the airstrikes, since going public might only escalate tensions. This changed after Monday’s attack, the first inside Lebanon itself.

The attack took place on a known smuggling route along the Syrian-Lebanon border, and a senior Lebanese security official said it targeted long-range surface-to-surface missiles from Syria heading to a Hezbollah depot in Lebanon’s Bekaa region. He said one Hezbollah official overseeing the operation was killed. The official spoke on condition of anonymity in line with regulations.

After two days of silence, Hezbollah confirmed the airstrike, saying it had caused material damage but no casualties. “We will retaliate for this Israeli aggression, and the resistance will choose the appropriate time and place as well as appropriate means to respond,” Hezbollah said. The Israeli military declined comment, though senior security officials, speaking on condition of anonymity because of the secrecy of the mission, confirmed Israel’s involvement.

Hezbollah’s participation in the Syrian war is highly controversial and divisive in Lebanon and has eaten away at the group’s wider base. But Hezbollah remains a formidable force in Lebanon, and has two ministers in the current national unity government that was recently formed following 11 months of impasse. After Wednesday’s threats against Israel, the group may lose credibility if it does not retaliate.

“They are in a fix,” said Hilal Khashan, a professor of political science at the American University of Beirut. “They very well understand that if they responded, the Israeli response will be overwhelming. They wouldn’t be able to cope with the consequences of an all-out offensive at this time,” he said. “That’s why I tend to think they will swallow their pride.”

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