U.S. stocks fell Monday, continuing a stretch of volatility as concerns about Federal Reserve tightening, escalation in the Ukraine war, and China-trade policy shake markets.The S&P 500 turned lower after opening with slight gains, shedding 27.27 points, or 0.7%, to close at 3612.39.The Dow Jones Industrial Average edged down 93.91 points, or 0.3%, to 29202.88, while the Nasdaq Composite fell 110.30 points, or 1%, to 10542.10.Continue reading your article witha WSJ membershipa WSJ membershipAlready a member?Sign In- ASOS:ASOS new customers coupon - 15% off when spending $50- Expedia:Today's Expedia promo code: Extra 10% off your stay- Ballard Designs:Sign up for email and receive 20% off at Ballard Designs- The Motley Fool:New members save 55% on Stock Advisor- Postmates:Save $5 on first 5 orders using Postmates promo code- Sephora:Today's Sephora coupon code: 12% off all mobile app purchases"