Following Russia’s decision to lift a ban on supplying S-300 missile systems to Iran, the Israeli PM has called President Putin to express his “grave concerns” – and received a detailed explanation of defensive weapons and the logic behind Moscow’s move.

According to a statement released by the Kremlin, Vladimir Putin “gave a detailed explanation of the logic behind Russia’s decision…emphasizing the fact that the tactical and technical specifications of the S-300 system make it a purely defensive weapon; therefore, it would not pose any threat to the security of Israel or other countries in the Middle East.”

The assurances do not appear to have had the desired effect. In a statement released by his office, the Israeli PM expressed “grave concerns regarding the decision,” and told Russia’s president that this step“will only encourage Iranian aggression in the region and further undermine the stability of the Middle East.”