All the IAF is doing is putting on a show of strength to send a message the US & Europe who are on the verge of lifting sanctions DONT DO IT OR ELSE WE WILL GO IT ALONE. Last thing the US especially wants is for Israel to attack Iran because the Iranians have said if either israel or America attacks then they will retaliate by not only hitting Israel but American airbases in the Gulf as well. If they did that of course it would be seen as a declaration same way bombing Pearl Harbour was considered a declaration of war and rather than bomb a few strategic targets Obama would be obligated to carry out a major operation to bomb Iran to the stone age and it would probably go regional, maybe Saudis getting involved driving up global oil prices top levels never seen before. High oil prices also means for ordinary people everything gets more expensive because transport cost will rise. So if Israel is forced to attack because sanctions are lifted the ordinary people worldwide will suffer. If the sanctions remain in place and Obama doesn't fall for Rohanis charms then it will be possible to control Bibi but if he comes under enough domestic pressure to act he will.
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from the article: Israel Air Force holds long-range drill over Mediterranean