"According to information of our military experts, the reason [behind the downing] was premeditated actions by Israeli pilots which certainly can not but harm our relations", Peskov told journalists.
Russia announced Monday that it will supply the Syrian government with modern S-300 missile defense systems following last week's downing of a Russian plane by Syria, a friendly fire incident that send regional tensions over the war-torn country soaring.
Shortly after Moscow's announcement, the Syrian president's office said Assad received a call from Vladimir Putin and that the two discussed the latest developments, including the Idlib deal and the delivery of S-300s.
Under orders from the Russian President, the Syrian army will receive a new S-300 surface-to-air missile system as well as new radar jamming technology.
Russian Federation launched its campaign in Syria to support President Bashar Assad in 2015 and though the involvement turned the tide of war in favor of Syrian government forces, Moscow has since played a careful balancing act, maintaining good ties both with Iran and Israel.
He said the Russian plane was downed by a Syrian anti-aircraft missile off the coast of the Latakia governorate on 17 September in response to an Israeli raid on Syrian targets.
Putin's spokesman, Dmitry Peskov, said that Russia's decision to deliver an S-300 was not targeted against anyone and was aimed exclusively to protect Russian troops in Syria.
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"Russia in this case is acting in its interests only, these actions are not directed against third countries, but towards defending our own military", he said. The Russian president also informed Assad of the S-300 delivery, it said.
Russian President Vladimir Putin looks through the porthole while aboard the presidential plane on December 11, 2017, during the approach to the Russian air base in Hmeimim in the northwestern Syrian province of Latakia.
"We are convinced that these measures will calm down some hotheads and keep them from careless actions which pose a threat to our troops", Mr Shoigu said. "What's important to us is that the weapons defense systems that the Russians transfer to Syria are not used against us".
A Russian military Ilyushin IL-20 landing at Kubinka air base on June 3, 2011.
The Israeli military on Sunday rejected the Russian defense ministry's claim that it was entirely to blame for the downing of a Russian spy plane by Syrian air defenses during an Israeli strike last week, reiterating that Syria was at fault. It has long lobbied Moscow not to provide the S-300 system to Syria.
But Shoigu said that the Israeli military warned Russian Federation about last week's strike just one minute before launching it and claimed it was being conducted in Syria's north.