As I looked out onto the deck of the Finnish patrol ship, armed men rappelled down from a helicopter and began to storm the ship. The masked guards raced to the bridge, shouting furiously, as they took control. Luckily for me, it was only a drill, performed by the Finnish Border Guard, who are on the front line against Russia, policing an 830-mile border along NATO’s eastern flank. The force also actively confronts Putin’s shadow fleet in the Gulf of Finland, and has raided vessels suspected of