The Syrian army has for years sought to obtain the S-300 system to counter Israeli air superiority, and Israel has in turn lobbied the Kremlin to refrain from supplying them.
The issue of the Russian-made S-300 missiles is believed to have been raised at the meeting as well.
Russian Deputy Foreign Minister Oleg Syromolotov said on Friday that a terror attack was foiled at Wednesday's Victory Day military parade in Moscow marking the anniversary of the Soviet Union's victory over Nazi Germany. Foreign Minister Sergey Lavrov said the strikes had removed any moral obligation Russian Federation had to withhold the missiles and Russia's Kommersant daily cited unnamed military sources as saying deliveries might begin imminently.
The comments come against the backdrop of a visit to Moscow by Israeli Prime Minister Benjamin Netanyahu this week.
Sports Digest: Nadal wins 50th straight set on clay to set record
In the quarter-finals, Lajovic will meet South Africa's Kevin Anderson who overcame German Philipp Kohlschreiber 6-3, 7-6 (9-7). British number one, Kyle Edmund , beat number eight seed David Goffin 6-3, 6-3 to move into the quarterfinals.
Vladimir Kozhin, a member of Putin's inner circle, told the Russian newspaper Izvestia that there has been no talk of delivering the S-300 system to Damascus. This included nuclear missiles, a flypast by Russia's new SU-57 stealth fighter, which has recently been deployed to Syria, and a new hypersonic missile, known as the Kinzhal, which Putin recently described as "invincible".
On Thursday, Israel said it had attacked almost all of Iran's military infrastructure in Syria after Iranian forces fired rockets at Israeli-held territory.
We have written extensively at Tsarizm about Russia's new role of arbiter she is now playing in the Middle East, attempting to prevent all-out conflict between Israel, Syria, Hezbollah, and Iran.
Although the more advanced S-400 system has replaced it, the S-300 is still very powerful and outperforms the current Syrian missile system. Some 28 Israeli aircraft fired around 60 air-to-surface rockets in a massive overnight strike in Syria, according to the Russian Defense Ministry.