"If the June deadline is not extended, and there's no deal to be had, we may very well see attacks from Iran against U.S. and European targets," he said.
Regional conflicts are also likely to spill over into cyberattacks, he said, such as what happened with Ukraine and Hong Kong in 2014.
"We might see more groups affiliated with ISIS conducting nuisance or propaganda attacks," he added. "We're also watching very carefully the South China Sea area."
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