Story highlights Retired Gen. David Petraeus, testifying before the Senate Armed Service Committee, suggested that the U.S. establish safe zones for Sunnis in Syria.

Russian moves in Syria are designed to bolster and hold on to their naval base and airstrip along the Mediterranean coast of Syria, Petraeus said.

Washington (CNN) One of America's top former generals compared the situation in Syria Tuesday to a historic nuclear disaster, implicitly criticizing the U.S. for allowing it to worsen, and accused Russia's President of trying to re-establish an empire.

Retired Gen. David Petraeus, testifying before the Senate Armed Service Committee, also recommended that the U.S. establish safe zones for Sunnis inside Syria and potentially put American boots on the grounds in Iraq to stop the spread of ISIS.

The former commanding general of U.S. forces in both Iraq and Afghanistan equated the situation in Syria today with one of the most deadly nuclear accidents in history.

Syria "is a geopolitical Chernobyl -- spewing instability and extremism over the region and the rest of the world," Petraeus told the Senate Armed Services Committee, referencing the 1986 nuclear meltdown in the former Soviet Union. "Like a nuclear disaster, the fallout from the meltdown of Syria threatens to be with us for decades, and the longer it is permitted to continue, the more severe the damage will be."

Part of the solution to stabilizing the situation inside Syria would entail helping to protect large swaths of the Sunni population from bombing by the regime of Syrian President Bashar al-Assad, in order to bring in more willing partners to fight ISIS.

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