Microsoft officials have warned that Russia’s intelligence apparatus has been engaged in another campaign to gain unauthorized access into thousands of U.S. government, corporate, and think tank networks. The ongoing cyber-espionage campaign appears to be focused on acquiring data that is stored in the cloud.

The activity further underscores Russia’s intent to target and compromise any entity that it feels vital to supporting its intelligence interests. The target list may be expansive, as a recent Microsoft report claimed more than half of nation-state attacks detected by the company have come from Russia.