Prime Minister Benjamin Netanyahu spoke Tuesday with Russian President Vladimir Putin amid rising tensions between the two countries after a Russian spy plane was shot down by Syria during an Israeli airstrike.

“The prime minister, in the name of the State of Israel, conveyed sorrow over the deaths of the Russian soldiers and said that the responsibility for downing the plane falls on Syria,” a statement from Netanyahu’s office said.

On Monday Syria accidentally shot down the Russian plane, killing all 15 crew members, when its air defenses swung into action against an Israeli strike. The Russian defense ministry blamed Israel, saying the IAF jets used the Russian plane as cover. However, Putin later told reporters that the downing of the plane by Syrian air defenses was a “chain of tragic accidental circumstances.”

Get The Times of Israel's Daily Edition by email and never miss our top stories Free Sign Up

In their call on Tuesday afternoon, “Prime Minister Netanyahu noted the importance of the continued security coordination between Israel and Syria that has managed to prevent many casualties on both sides in the last three years,” the Israeli statement said.

The Kremlin said that Putin emphasized that the Israeli attack violated Syria’s sovereignty and also breached the Russian-Israeli agreements on avoiding clashes in Syria. The Russian leader urged Netanyahu “not to allow such situations in the future.”

Earlier Israel said its jets had attacked a Syrian military facility that manufactured “accurate and lethal weapons,” which were “about to be transferred, on behalf of Iran, to Hezbollah in Lebanon.”

Netanyahu told Putin that Israel was “determined” to prevent Iranian military entrenchment in Syria, and the attempts by Iran, which calls for the destruction of Israel, to transfer to Hezbollah lethal weaponry (to be used) against Israel.”

Netanyahu also reiterated that Israel would completely share all the information it had on the circumstances of the raid and suggested sending Israel’s air force chief to Moscow to “deliver all the needed information.”

The conversation came on Tuesday evening just before Israel began observing Yom Kippur, the holiest day of the Jewish year.

Earlier Tuesday Putin confirmed that Israel did not shoot down the plane.

“It rather looks like a chain of tragic accidental circumstances,” Putin told reporters, rejecting any comparisons with the downing of a Russian jet by Turkey in 2015.

“An Israeli jet did not shoot down our plane,” Putin said.

The Russian defense ministry on Tuesday morning had blamed Israel for the accident and warned of reprisals.

Putin said he had signed off on the defense ministry statement. “No doubt we should seriously look into this,” Putin said, speaking at a news conference after talks with Hungarian Prime Minister Viktor Orban.

Israel said its deputy ambassador in Moscow Keren Cohen-Gat was summoned to the Russian foreign ministry. The Israeli Foreign Ministry said there would be no comment on what was discussed.

Putin also said Moscow would beef up security for Russian military personnel in Syria as a priority response. “These will be the steps that everyone will notice,” he said, without providing further details.

He expressed condolences to the families of the victims, calling the accident a “tragedy for us all.”

Syria accidentally shot down the Russian plane late Monday, killing all 15 crew members, when its air defenses swung into action against an Israeli strike. The incident was the worst case of friendly fire between the two allies since Russia’s game-changing military intervention in September 2015.

The Russian plane was downed by a Russian-made S-200 air defence supplied to Syria.

The Israeli military on Tuesday acknowledged conducting an airstrike against a Syrian weapons facility the night before and “expressed sorrow” for the deaths of the 15 Russian airmen.

In a statement, however, the Israel Defense Forces denied all responsibility for the downing of the Russian spy plane, saying that Syria, Iran and Hezbollah were the ones at fault.

“Israel expresses sorrow for the death of the aircrew members of the Russian plane that was downed tonight due to Syrian anti-aircraft fire,” the IDF said, and noted that the Russian plane that was hit “was not within the area of the operation.”

The Israeli strike was conducted at approximately 10 p.m. by four F-16 fighter jets, according to the Russian military.

Syrian air defenses opened fire at the incoming missiles, at the attacking aircraft and — according to Israel — at nothing in particular. The Russian Il-20 was shot down in the air battle, along with its crew.

“The Syrian anti-air batteries fired indiscriminately and, from what we understand, did not bother to ensure that no Russian planes were in the air,” the army said.

According to the IDF, the target of its Monday night strike was a Syrian military facility that manufactured “accurate and lethal weapons,” which were “about to be transferred, on behalf of Iran, to Hezbollah in Lebanon.”

The target of the Israeli strike was identified by Syria as a subsidiary of its defense ministry, known as the Organization for Technical Industries, which has suspected ties to the country’s chemical weapons and missile programs.

“These weapons were meant to attack Israel, and posed an intolerable threat against it,” the army said.

Though Israeli officials have said, generally, that military conducts operations inside Syria against Iranian and Hezbollah targets, the IDF rarely acknowledges specific airstrikes, preferring instead to adopt a formal policy of neither confirming nor denying the attacks attributed to it.

The military said its initial investigation found that its strike was completed before the Russian plane entered the area of the operation and that the reconnaissance aircraft was shot down after the Israeli fighter jets had returned to Israeli airspace.

“Israel holds the Assad regime, whose military shot down the Russian plane, fully responsible for this incident. Israel also holds Iran and the Hezbollah terror organization accountable for this unfortunate incident,” the army added.

This appeared to refute the claim made by Moscow that the Israeli pilots used the surveillance plane as cover for their attack.

Russian Defense Minister Sergei Shoigu also accused Israel of failing to inform the Russian military of its plans, which he said would have been in the “spirit” of Israeli-Russian coordination in Syria. The Russian defense ministry said Israel warned them of the impending strike “less than a minute” before it began, which left them insufficient time to clear their personnel from the area.

The Israeli and Russian militaries maintain what they call a “deconfliction mechanism,” which is meant to coordinate their activities in Syria in order to avoid incidents like this one. Until Monday night, these efforts had largely succeeded in preventing direct or indirect clashes since Russia became more deeply involved in the Syrian civil war three years ago.

The Israeli military said it had coordinated with Russia ahead of the attack, though it did not address Moscow’s specific claims about the amount of time between the notification and the airstrike itself.

The IDF also said it would “share all the relevant information with the Russian government to review the incident and to confirm the facts in this inquiry.”