Obama's Pentagon nominee suggests support for arming Ukraine

* Carter clarifies remarks, puts onus on sanctions * Maintaining U.S.-EU solidarity seen as critical * Carter expected to win confirmation easily (Adds Carter, White House comments) By Phil Stewart and Andrea Shalal WASHINGTON, Feb 4 (Reuters) - President Barack Obama's pick to become defense secretary told Congress on Wednesday he was leaning in favor of providing arms to Ukraine but later cautioned that the focus must remain on pressuring Russia economically and politically. Ashton Carter, a f