The Kremlin said on Monday Russia has granted political asylum to overthrown Syrian President Bashar al-Assad, a decision it said was taken by President Vladimir Putin.

Kremlin spokesperson Dmitry Peskov declined to comment on Assad's specific whereabouts and said Putin was not planning to meet with him.

Syrian rebels, led by an alliance by Hayat al-Tahrir al-Sham (HTS), a former al-Qaeda affiliate, reached Damascus over the weekend and overthrew Assad's government following nearly 14 years of civil war. Assad's overthrow, which appeared unthinkable just two weeks ago, raised hopes for a more peaceful future but also concerns about a potential security vacuum in the country, which is still split among armed groups.

Assad had been Syria's leader since 2000, succeeding his father, who had been president for three decades.

Peskov said it was too early to say what the future would hold for Russia's military bases in Syria, adding that it would be the subject of discussion with the new rulers in Damascus.

"This is all a subject for discussion with those who will be in power in Syria," Peskov said, adding that there was "extreme instability" in the country.

"Of course, everything is being done now that is necessary and everything that is possible in order to get in touch with those who can deal with security. And, of course, our military is also taking all necessary precautions," Peskov said.

Moscow has used Syria as a staging post to fly its military contractors in and out of Africa.

Israeli military controlling buffer zone

Israelis have welcomed the fall of Assad, who was a key ally of Iran and Lebanon's Hezbollah militant group, while expressing concern over what comes next.

Israel struck suspected chemical weapons sites and long-range rockets in Syria in order to prevent them from falling into the hands of hostile actors, the foreign minister said Monday.

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Israel says its forces temporarily seized a buffer zone inside Syria dating back to a 1974 agreement after Syrian troops withdrew in the chaos.

"The only interest we have is the security of Israel and its citizens," Gideon Saar told reporters on Monday. "That's why we attacked strategic weapons systems, like, for example, remaining chemical weapons, or long-range missiles and rockets, in order that they will not fall in the hands of extremists."

Saar did not provide details about when or where the strikes took place.

An Associated Press journalist in Damascus reported airstrikes in the area of the Mezzeh military airport, southwest of the capital, on Sunday. The airport has previously been targeted in Israeli airstrikes, but it was not immediately clear who launched the latest strike.

Israel has carried out hundreds of airstrikes in Syria in recent years, targeting what it says are military sites related to Iran and Hezbollah. Israeli officials rarely comment on individual strikes.

Syria agreed to give up its chemical weapons stockpile in 2013, after the government was accused of launching an attack near Damascus that killed hundreds of people. But it is widely believed to have kept some of the weapons and was accused of using them again in subsequent years.