Syria's state news agency SANA claimed air defenses on blocked an Israeli missile attack on army positions in southwest Syria near the Golan Heights.
SANA quoted a military source saying the attack near Hader village near Golan Heights only caused material damage.
Israeli Prime Minister Benjamin Netanyahu met with Russian President Vladimir Putin in Moscow on Wednesday.
The patients, Israeli medical officials said, were not the walking wounded of the seven-year-old Syrian civil war but children with chronic health problems coming across the frontier for a day's treatment in a hospital in northern Israel.
Israeli soldiers stand guard as Syrians walk into a checking room just after they crossed the armistice line to the Israeli-occupied Golan Heights to get medical treatment in Israel, July 11, 2018.
But diplomats on both sides say Russian Federation has made clear that it would oppose any Israeli action endangering Assad's rule.
"A drone penetrated from Syria's territory to Israel's territory several hours ago".
Israel will not dismiss the possibility of future relations with Syrian President Bashar al-Assad, Defence Minister Avigdor Lieberman said on Tuesday.
The Netanyahu government is detemined to keep fighters loyal to Assad and to Iran out of the Syrian Golan border area near Israel.
The air force has struck many targets it describes as Iranian deployments or arms transfers to Iran supported Hezbollah.
The Russian Minister noted that the aggression launched by the US, Britain. and France against Syria showed the necessity of Syria possessing modern air defenses, and Moscow is ready to discuss this issue.
Israel has signalled openness to eventual ties with Assad, a tacit acknowledgement that he is re-consolidating power as he routs Syria's rebels.
Under Assad family rule, Syria held direct negotiations with Israel in the United States in 2000 and indirect talks mediated by Turkey in 2008, discussions predicated on a full or partial return of the Golan.
Earlier on Wednesday, the Israeli army said the downed drone may have been on an intelligence mission.