It is backed by three attack submarines, one of which is carrying 154 Tomahawk missiles.
On Friday, President Obama re-iterated his pledge to do everything in his power to avert the emergence of a nuclear-armed Iran. He said even military action remained an option.
TASS
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Iran instals uranium-enriching centrifuges of higher performance
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Iran confirms 10 new nuke plants
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Bushehr NPP taken to minimum controllable capacity level
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Sarkozy: strikes against Iranian nuclear facilities a possibility
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IAEA 'worried' by Iran nuclear effort
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Iran offers IAEA full oversight over its nuclear effort
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Iran starts nuclear fusion research
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Nuclear scientist killed in Tehran
Two explosions hit Lebanon's capital, at least 5 injured - reports