U.S. stock benchmarks closed sharply lower Thursday, with the Dow Jones Industrial Average slumping more than 600 points, amid renewed worries that Russia may soon invade Ukraine. The Dow DJIA, -1.78% ended about 1.8% lower, while the S&P 500 SPX, -2.12% dropped about 2.1% and the tech-laden Nasdaq Composite COMP, -2.88% slid around 2.9%, according to preliminary FactSet data. President Joe Biden told reporters Thursday morning that a Russian invasion could happen in the next “several days.” Nearly all of the S&P 500’s 11 sectors finished lower in Thursday’s slump, with losses led by information technology, preliminary FactSet data show. The Dow’s 1.8% slide was its largest daily drop since Nov. 30, according to Dow Jones Market Data.