OpinionOPINION: Navalny's arrest may hit Russia's Nord Stream 2 plansGas export pipeline likely to be targeted in response to arrest of Russian opposition leaderWide support: a man holds a placard picturing Alexei Navalny as Russians gather outside a police station near Moscow where the opposition leader is being held following his detention on arrival at Sheremetyevo airportPhoto: REUTERS/SCANPIXVladimir AfanasievMoscow