Russia’s Defense Ministry on Wednesday published a video of the delivery of S-300 missile defense systems to Syria, in a move that is expected to inflame tensions in the region further.

Moscow’s deployment of the air-defense system in the country has been a point of contention with Israel and the US, but Israeli officials played down the capabilities of the missiles.

Russia confirmed the delivery of the missiles via Twitter:

Israel responded that the missile system was obsolete in its ability to repel strikes from F-35 stealth fighters.

“The operational abilities of the air force are such that those [S-300] batteries really do not constrain the air force’s abilities to act,” a top Israeli defense official said, according to a report in Channel News Asia.

Referring to the fifth-generation fighter jets, the official said: “You know that we have stealth fighters, the best planes in the world. These batteries are not even able to detect them.”