This isn't true though. Pretty much all countries with the capability and incentives to perform cyber attacks do, including the US. For example,
US attacks on Russian power grid: https://www.nytimes.com/2019/06/15/us/politics/trump-cyber-r...
US attacks on Iranian nuclear facilities: https://en.wikipedia.org/wiki/Stuxnet https://en.wikipedia.org/wiki/Operation_Olympic_Games
This isn't true though. Pretty much all countries with the capability and incentives to perform cyber attacks do, including the US. For example,
US attacks on Russian power grid: https://www.nytimes.com/2019/06/15/us/politics/trump-cyber-r...
US attacks on Iranian nuclear facilities: https://en.wikipedia.org/wiki/Stuxnet https://en.wikipedia.org/wiki/Operation_Olympic_Games