Why is Benjamin Netanyahu meeting with Putin on Iran, instead of Hassan Rouhani?

The answer is quite simple. Iran understands that Israel is not going to withdraw the Purple Line and return the Golan Heights to Syria.

Israel and their elite mafia cohorts at Genie Energy Ltd. (AKA Rupert Murdoch, Dick Cheney, and red shill Jacob Rothschild) are drilling for oil in the occupied Golan:

Cheney, Rothschild, and Fox News’ Murdoch Begin Drilling for Oil in Syria — a Violation of Int’l Law

Bibi is basically going to try and cut a deal with Putin for the long term destabilization of Iran, since they now have found an abundant new source of oil and gas, which is in direct competition to Western/Gulf State resource economy:
http://www.presstv.ir/Detail/2017/02/05/509193/Iran-announces-major-oil-gas-discoveries–