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Dominic Purcell couldn't be happier for his friend and former co-star. Just days after Wentworth Miller came out as gay, his former "Prison Break" castmate told Us Weekly how proud he is of him.

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"As a friend and someone I care for deeply, I am very proud of Wentworth," the 43-year-old told Us. "I wish him much happiness and peace. I applaud his courage and his stance against a wrongful, archaic ideology." The two played brothers on the FOX series from 2005 to 2009.

On Wednesday, Miller, 41, came out as gay in a letter to the organizers of the St. Petersburg International Film Festival in Russia to explain why he couldn't attend an upcoming event.

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"Thank you for your kind invitation. As someone who has enjoyed visiting Russia in the past and can also claim a degree of Russian ancestry, it would make me happy to say yes," he wrote in the letter, posted to GLAAD's website. "However, as a gay man, I must decline."

Miller joins millions protesting Russia's controversial anti-gay laws banning the adoption of Russian-born children to national and international same-sex couples.

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He added: "The situation is in no way acceptable, and I cannot in good conscience participate in a celebratory occasion hosted by a country where people like myself are being systematically denied their basic right to live and love openly."

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