By Joseph Menn SAN FRANCISCO (Reuters) – Hacking for espionage purposes is sharply increasing, with groups or national governments from Eastern Europe playing a growing role, according to one of the most comprehensive annual studies of computer intrusions. Spying intrusions traced back to any country in 2013 were blamed on residents of China and other East Asian nations 49 percent of the time, but Eastern European countries, especially Russian-speaking nations, were the suspected launching site for 21 percent of breaches, Verizon Communications Incs said in its annual Data Breach Investigations Report. Though the overall number of spying incidents studied tripled to 511 from total in the 2013 Verizon report, most of that increase is due to the addition of new data sources. Even looking at just the same contributors as before, however, espionage cases grew, said Verizon investigator Bryan Sartin.