What was behind the Saudi detente with Iran?

The growing Middle East alliance among states aligned against Iran, spearheaded by Israel, seems to be frozen in its tracks by the sudden thawing of ties between Riyadh and Tehran.

So what does it mean for the geopolitics of the region, and does this mean a Saudi-Israel normalization is even less likely to occur?

Sima Shine, head of the Iran program at the Institute for National Security Studies, discusses all this, as well as what Riyadh's motives for the rapprochement might have been to begin with.