Obama administration officials say the China case is different because it was purely a case of spying - something the United States does as well. U.S. officials also say that China responded to U.S. pressure after the hack was discovered, and there are signs its espionage activities have been reduced. China may have been receptive to U.S. pressure at the time because President Xi Jinping was about to visit the United States, and he did not want the hack to mar the visit.