Forbes:

Iran might soon receive advanced Su-35 Flanker-E multirole fighter jets from Russia and possibly other military equipment, including S-400 air defense missile systems. How substantially these acquisitions could ultimately affect the power balance in the Middle East remains to be seen.

A mockup of a Su-35 recently photographed by satellite outside Iran’s southern underground Eagle 44 airbase further fueled speculation that Iran expects to receive that aircraft as part of its most substantive fighter order in over 30 years.

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