** U.S. defense stocks rise premarket after Russia's nuclear policy update
** Russian President Vladimir Putin issues warning to the United States, lowering threshold for nuclear strike
** Warning issued days after Joe Biden administration reportedly allowed Ukraine to fire American missiles deep into Russia
** Shares of defense contractor Lockheed Martin up 1.3%, while Arlington, Virginia-based RTX rises 1.2%
** Shares of General Dynamics up 0.8%; Northrop Grumman up 1.1%
** Geopolitical conflicts have boosted demand for arms manufacturers such as LMT, RTX and NOC, prompting them to raise their expectations for 2024
(Reporting by Rupali Chaudhary in Bengaluru)
((Rupali.Chaudhary@thomsonreuters.com))
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