Russia is likely to sell even more of its most modern anti-aircraft and anti-missile defense systems to Iran, according to the head of the nation's main arms export corporation.

The move looks certain to even further strain relations between Moscow and Washington that are already now as fraught as at any time since the darkest days of the Cold War.

"Contacts between our countries (on delivery of air defense systems) are continuing, and we do not see any reason to suspend them," Rosoboronexport General Director Anatoly Isaikin told a news conference at the Africa Aerospace & Defence-2008 exhibition near Cape Town, South Africa, on Sept. 18, RIA Novosti reported.

Isaikin was speaking not long after Russia sent to Iran Tor-M1 air defense missile systems worth $700 million that Tehran had ordered in late 2005, as previously reported in these columns. RIA Novosti also confirmed that Russian advisers had prepared "Iranian Tor-M1 specialists, including radar operators and crew commanders," to operate the new systems. The Tor-M1 will certainly upgrade Iran's air defenses against any future Israeli or U.S. pre-emptive air strikes to knock out Iran nuclear facilities.

Isaikin's comments indicated that Russia may go even further and also sell to Tehran its advanced S-300 missile system, the S-300PMU1 -- NATO designation SA-20 Gargoyle. RIA Novosti described this system as having a range of more than 100 miles with the capability of destroying ballistic missiles and operating at both low and high altitudes.

Some analysts have even claimed that the S-300 could have an 80 percent interception rate capability against America's old, slow and in many respects obsolete subsonic Tomahawk cruise missiles.

The Russian report also noted that Iran had already carried out several air defense maneuvers this year, culminating in what it described as "a three-day series of Air Force and missile defense exercises on Sept. 15 to 18."