Russia will supply an S-300 surface-to-air missile system to Syria within two weeks, Defence Minister Sergei Shoigu said on Monday, a week after Russia blamed Israel for indirectly causing the downing of a Russian military plane in Syria.

Axar.az reports citing Reuters.

The crash which killed 15 Russian service members had forced Moscow to take “adequate retaliatory measures to increase the safety of Russian military fighting international terrorism in Syria,” Shoigu said in a televised address.

Israel, which has struck Syria scores of times during the seven-year war, has said it will work to improve “deconfliction” of its missions with Russian forces, but will not halt them. It has long lobbied Moscow not to provide the S-300 to Syria.

Shoigu said Russia will equip Syrian anti-aircraft units with Russian tracking and guidance systems in order to identify Russian aircraft.

Russia in April had hinted that it would supply the S-300 to President Bashar al-Assad despite Israeli objections.

Israel says its air strikes on Syria are not a threat to Russia’s ally Assad, but that it must carry them out to halt arms shipments to Iranian-backed Lebanese group Hezbollah. It has made repeated efforts to persuade Moscow not to sell S-300s to Syria, as it fears this would hinder its aerial capability.