I'm with Turambar.
After the exchange between Mandos and Feanor, Nienna mourned at the decision of Feanor, and while she was mourning the messengers came from Formenos to tell of the deed Melkor had done. I don't know exactly how far Formenos is from the Ring of Doom, but I always got the impression that the two events (Valar and Feanor; Melkor and Finwe) were taking place simultaneously.
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