I think the promise was to Netanyahu to go to war with Iran.

[moondust]

8. Drone attack

on Saudi oil came three days before the Israeli election. Gantz has said in the past that there is "no daylight" between him and Netanyahu on Iran, although it's obviously strongman Netanyahu who has a long history of using Iran as a boogeyman.

A Jerusalem Post article from March 2018 titled "How Israel became a leader in drone technology" claimed:

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Israel is the world’s largest exporter of military drones...
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...That makes (Israel's) Airobotics drones ideal for monitoring tough-to-reach industrial sites like mines, ports and assets owned by oil and gas companies.
~

Israel appears to be a little farther away from those Saudi oil fields than Yemen.

Just sayin'...