By Lewis Krauskopf, Devik Jain and Sabahatjahan Contractor (Reuters) – Major U.S. stock indexes ended lower in rocky trading on Tuesday, as investors weighed fast-paced developments around the crisis in Ukraine as the United States banned Russian oil and other energy imports over the invasion. Losses accelerated into the end of Tuesday’s up-and-down session, a day after steep declines that saw the tech-heavy Nasdaq confirm it was in a bear market. The benchmark S&P 500 fell for a fourth straight session. U.S. President Joe Biden announced the ban on Russian oil and other energy imports, unders…