Chinese cyber spying on American companies has decreased since a September agreement between presidents Barack Obama and Xi Jinping, according to government and private sector experts, but officials are undecided about the significance of the shift, reports the Financial Times. Obama administration officials have been cautious in their public assessments of China’s behaviour since the two governments agreed last year to refrain from conducting cyber espionage for commercial purposes. The accord followed years of escalating American complaints that China was hacking into US companies on a massive scale to steal trade secrets and intellectual property.