Boeing ( BA ) was the biggest loser, falling 2.2%, while Coca-Cola ( KO ) ended the day flat. President Donald Trump this morning warned Russia that U.S. missile strikes in Syria were imminent, sending stocks on a downward spiral out of the gate. However, the core CPI -- which excludes food and energy costs -- surged 2.1% year-over-year, marking the biggest jump since March 2017, and roughly in line with the Fed's inflation expectations .