Under an icy rain, camouflage-clad Swedish soldiers crouched behind a log pile, aimed their machine guns towards the Baltic Sea and, at their officers' barked orders, opened fire down the snow-covered range. It was routine training for the young recruits based on the Baltic island of Gotland, but these troops are at the forefront of Sweden's efforts to bolster its military as Stockholm worries about Russian intentions in Europe and the Baltic.