WASHINGTON — The U.S. State Department refused to comment on Russia's request to hand over Russian businessman Leonid Nevzlin, currently on international wanted list. State Department spokesman Tom Casey said the department has never commented on extradition requests, adding that there is no bilateral agreement on extradition between the United States and Russia. Casey said he had no information on whether Nevzlin is still in the United States. On Tuesday, Russia asked the United States to hand over the former top Yukos manager, who has reportedly been in the Unites States for a week. On Wednesday, Nevzlin asked the U.S....