The US Senate Foreign Relations Committee’s hearing on several key national-security nominees on Wednesday doubled as a stress test of Washington’s posture toward Russia and NATO’s eastern flank, with Chairman Jim Risch (R-ID) and Ranking Member Jeanne Shaheen (D-NH) offering sharply divergent interpretations of US commitment abroad. What was billed as a routine nominations session quickly morphed into a pointed examination of American resolve in Europe, the future of nuclear arms control, and