Supposedly Israel waited 15 minutes before shooting it down, so they could check with the Russians, and make sure it wasn't theirs before shooting it down.
"We will continue to act decisively against any spillover and any infiltration of Israeli territory or airspace", Netanyahu said.
In a reminder of the volatile situation, Netanyahu pointed at an incident earlier Wednesday in which the Israeli military fired a Patriot missile to shoot down a drone that had infiltrated Israeli airspace from Syria.
While the Russian and Israeli leaders sat down for talks in the Kremlin, a senior Iranian envoy also headed to Moscow amid intensive Syria-focused diplomatic efforts ahead of Putin's summit in Helsinki on Monday with President Donald Trump.
Israel worries Assad could let his Iranian and Hezbollah reinforcements entrench near Israeli lines or that Syrian forces may defy a 1974 Golan demilitarization.More news: Remainer Brands Theresa May A "Hero" Over Chequers Brexit Plan
"They are treated in hospital and go back the same day", said Major Sergei Kutikov, an Israeli military health officer.
Russia, another top key ally of Assad, has warned it would be unrealistic to expect Iran to fully withdraw from the country.
Israel has warned Iran, which is allied with the Syrian government, against building up a military presence on its doorstep.
However, Lieberman appeared to signal acknowledgment that Assad would regain control of the Syrian side of the Golan.
Under Assad family rule, Syria held direct negotiations with Israel in the United States in 2000 and indirect talks mediated by Turkey in 2008.
Israel has been on high alert as Assad's forces advance on rebels in the vicinity of the Golan Heights, much of which Israel captured from Syria in 1967 and annexed in a move not recognized internationally. Netanyahu's government has made clear it would not now cede the Golan and has been lobbying for USA recognition of Israel's claim of sovereignty there.