We hate to say we told you so (actually, we revel in it), but we surmised early on (without any real information) that the Stuxnet virus was the result of a nation state's activity to impact the Iranian nuclear development. Now it appears that we were probably correct. Stuxnet set back the Iranian nuclear program by several years by causing the centrifuges to rotate in excess of their capacity. It has been hailed as being as effective as a military strike but in spite of being more sophisticated than any previous malware, it was messy in that it didn't really cover its tracks like some other malware.
Kinda like a military strike.