Sanctions are mandatory under U.S. law when an undeclared nuclear state explodes a nuclear device.
State Department spokesman James Rubin said the president is sending Deputy Secretary of State Strobe Talbot to Pakistan to ask that nation to show restraint. Pakistan has promised to match any nuclear advances by India. The two nations have fought three wars since 1947. Bar the export of certain defense and technology material. End U.S. credit and credit guarantees to India.