Varun Dhawan and Samantha Ruth Prabhu, on Tuesday, joined Priyanka Chopra Jonas, Richard Madden and Stanley Tucci at the global premiere of the upcoming spy-thriller series, ‘Citadel’, in London. The two Indian actors play the lead roles in the Indian version of the Russo Brothers’ series. The makers of the Indian version, Raj Nidimoru and Krishna D.K. were also part of the starry premiere.