Described by both Moscow and the West as an act of sabotage, the explosions in 2022 largely severed Russian gas supplies to Europe, marking a major escalation in the Ukraine conflict and squeezing energy supplies on the continent. No one has taken responsibility for the blasts and Ukraine has denied any role. <br><br> "This morning, he was detained in a town near Warsaw," Volodymyr Z.'s lawyer Tymoteusz Paprocki said. <br><br> Private broadcaster RMF FM first reported the arrest. It said Volodymyr Z. was detained in Pruszków, west of the capital. <br><br> <h2>Suspect to fight transfer to Germany</h2>