Israel is looking into reports that Russia plans to sell 250 advanced long-range Sukhoi-30 fighter jets to Iran in an unprecedented billion-dollar deal.

According to reports, in addition to the fighter jets, Teheran also plans to purchase a number of aerial fuel tankers that are compatible with the Sukhoi and capable of extending its range by thousands of kilometers. Defense officials said the Sukhoi sale would grant Iran long-range offensive capabilities.

Government officials voiced concern over the reports. They said Russia could be trying to compete with the United States, which announced over the weekend a billion-dollar arms sale to Saudi Arabia and other Gulf states.

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Despite Israeli and US opposition, Russia recently supplied Iran with advanced antiaircraft systems used to protect Teheran's nuclear installations. At the time, Moscow said it reserved the right to sell Iran weapons, such as the antiaircraft system, that were of a defensive nature.

The Sukhoi-30 is a two-seat multi-role fighter jet and