With the stroke of a pen, our world got quite a bit more dangerous today.

President Barack Obama on Saturday signed an executive order lifting some of the U.S. economic sanctions on Iran, the White House announced.The move follows the International Atomic Energy Agency saying Iran has completed the necessary steps in a deal to restrict its nuclear program.

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But not all nuclear-related sanctions will be rescinded immediately — that won’t happen for about 10 years, should the deal hold. But this month’s milestone will mean Iran will be able to sell its oil again on world markets and its banks will be able to connect to the global system.