Israel said Monday it will not allow "sophisticated weapons" to fall into the hands of its enemies, after furious claims from Syria that Israeli warplanes carried out air strikes near Damascus.
The Jewish state refused to confirm or deny the strikes, but its forces have previously targeted weapons allegedly destined for arch-foe Lebanon's Hezbollah.
The two strikes on Sunday, including one on the country's main international airport, were fiercely condemned by Damascus, which called for UN sanctions against Israel.
Asked about the strikes on public radio, Intelligence Minister Yuval Steinitz refused to comment directly but stressed Israel's policy of preventing arms transfers to militant groups.
"We have a firm policy of preventing all possible transfers of sophisticated weapons to terrorist organisations," Steinitz said, in a clear reference to the Shiite militant group Hezbollah.
A UN spokesman said its observer force in the Occupied Golan Heights had witnessed "six aircraft flying in high altitude on the Alpha (Israeli) side," two of which then crossed into Syrian airspace.
Israel has launched a series of air strikes inside Syria since the outbreak of the country's armed uprising in 2011, including raids reportedly targeting Iranian rockets bound for Hezbollah.
The Syrian army said Sunday's strikes by "the Israeli enemy" had targeted two areas near the capital, including Damascus International Airport, which is used by both civilian and military aircraft.
It said the strikes caused damage but that nobody was hurt.
"This direct aggression by Israel was carried out to help the terrorists in Syria," the army said, using the regime's collective term to refer to peaceful opponents, armed rebels and jihadists fighting in Syria.
There was no threat of retaliation, but the Syrian foreign ministry said it had asked UN Secretary General Ban Ki-moon and the Security Council to impose sanctions on Israel, describing the strikes as "a heinous crime against Syria's sovereignty".
According to the Britain-based Syrian Observatory for Human Rights, which monitors the conflict, both of the targeted sites were used for military purposes.
"Both were military sites, and weapons were being stored there," Observatory director Rami Abdel Rahman told AFP.
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Syria's regime is a close ally of Hezbollah, which has launched numerous attacks against Israeli forces and in 2006 fought a month-long war with the country.
The movement has fought alongside the forces of Syrian President Bashar al-Assad, whose Alawite sect is an offshoot of Shiite Islam, against the mainly Sunni fighters opposing his regime.
Israeli media said the latest raid had targeted weapons such as anti-tank rockets and surface-to-air missiles meant to be delivered to Hezbollah.
There was little doubt among Israeli commentators on Monday that the country had carried out the strikes.
"There must have been a brief window of opportunity yesterday and the decision to strike was taken," Israeli army radio said.
Some Israeli opposition figures raised questions about the timing of the strikes, which came after Prime Minister Benjamin Netanyahu called early elections.
Netanyahu is looking to shore up his support on the right ahead of primaries for his Likud party and the snap vote in March.
"I hope this isn't the opening salvo of the campaign for the Likud primaries and the next elections," Ilan Gilon of the leftwing Meretz party said.
Steinitz dismissed claims of any political motive as "ridiculous and harmful".
Some commentators said a possible response from Damascus or Hezbollah to the strikes could set the tone for the election.
"The Syrians' response... will dictate the headlines and the public focus in the coming weeks and months."
That response would most likely come through Hezbollah, and against Israeli troops, security analyst Daniel Nisman said.
"It could be something abroad, like an attack against Israelis... but it's more likely to be some kind of IED (improvised explosive device) attack on the border, against an IDF (army) patrol," he told AFP.
A roadside bomb attack in October claimed by Hezbollah wounded two Israeli soldiers near the Lebanese ceasefire line in the Israeli-occupied sector of the Golan.
The Syrian conflict, which evolved from a pro-democracy movement into a full-blown civil war, is estimated to have killed more than 200,000 people and forced half the population to flee their homes.