Nation

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A tense security situation continues to dog the Russian republic of Chechnya, despite efforts by Moscow to reduce the federal forces patrolling the war-torn region and encourage Chechens who have fled the country to return to their homeland.

With a top Iraqi biological weapons expert reportedly in U.S. custody, U.S.-led coalition forces continue their search for evidence of biological, chemical or nuclear weapons in Iraq. Experts offer their opinions on the status of the search.

Defense Secretary Donald Rumsfeld told U.S. troops in Qatar on Monday that the conflict in Iraq marked a turning point in the history of warfare. Margaret Warner examines this change with military experts Lucian Truscott IV, James Dunnigan, Winslow Wheeler,…