Their country has also been hit by the timeline change.

This is not a war between human beings this is manipulation on human beings!

"But there was no disagreement about the damage. From the final weeks of 2010 through the end of 2012, according to former American officials, the Chinese killed at least a dozen of the C.I.A.’s sources. According to three of the officials, one was shot in front of his colleagues in the courtyard of a government building — a message to others who might have been working for the C.I.A."

https://www.nytimes.com/2017/05/20/world/asia/china-cia-spies-espionage.html

Why exactly between these years 2010 - 2012?

When did the significant change in the timeline begin?