 Iran has enriched uranium to up to 63 percent purity at its above-grant Natanz enrichment plant, even higher than 60 percent it had announced. The UN nuclear watchdog said on Tuesday in a report citing fluctuations in enrichment levels. And Russian President Vladimir Putin has submitted legislation to Parliament to formalize a Russian exit from the Open Skies Treaty, a pact that allows on armed surveillance flights over member countries. United States left the Open Skies Arms Control and Verification Treaty in November in one of Donald Trump's final acts as president. Washington accused Russia of violating it, which Moscow denied. Russia said in January it would also withdraw from the treaty. Kremlin spokesman Dmitry Peskov on Tuesday said one of the reasons behind Russia's planned withdrawal was that the United States was still able to receive information acquired through the Open Skies Treaty from its NATO allies.