Major US stock indexes ended lower as a strong report on job gains failed to impress investors. Stocks rose early after the government reported US employers hired at the fastest pace in two years last month. Markets turned, however, on news of downed helicopters and killed fighters in eastern Ukraine. Early Friday Ukrainian government forces attacked pro-Russian insurgents in the region. Among the day’s biggest losers was LinkedIn, which reported its largest quarterly loss since it went public. Expedia, the online travel site, fell nearly 4%, and Pfizer fell 1.28% after the drug company’s latest offer to buy AstraZeneca was rejected.