U.S. stocks eased on Friday as an upbeat jobs report was offset by concerns about more violence in Ukraine. Healthcare shares were among the biggest drags on the S&P 500, including U.S. drugmaker Pfizer Inc . Its shares lost 1.4 percent to $30.70 after its sweetened 63 billion pound ($106 billion) bid for AstraZeneca Plc was promptly rejected by the British company Friday.