High above a railway bridge spanning a foaming river just outside the Arctic Circle, Finnish construction workers hammer away at a project that will smooth the connections from NATO's Atlantic coastline in Norway to its new border with Russia. Until February 2022, the 37-million euro ($41 million) electrification of this short stretch of rail – the only rail link between Sweden and Finland – simply promised locals a chance to catch a night train down to the bright lights of Stockholm. After Russia invaded Ukraine, that changed.