The Obama administration has been dealt a major setback in efforts to obtain Senate ratification of an arms reduction treaty with Russia. The New Strategic Arms Reduction Treaty, or New START, calls for the United States and Russia to cut their deployed arsenals to 1,550 nuclear warheads and 700 missile silos and bombers each. On Tuesday, Republican Senator Jon Kyl of Arizona said the pact shouldn’t be voted on until next year. Kyl had previously broken with other Republicans to back the treaty. His new stance means Democrats will have to obtain 14 Senate Republican votes in the next Congress instead of the eight they would currently need with a greater Senate majority.