KIEV, July 28 - Software for hacker attacks on Ukrainian companies was designed in Russia and attacks were planned for at least six months, National Security and Defense Council spokesman Valentyn Petrov said.

"This process lasted for at least six months. Not only Ukrainian energy companies (this is only the tip of the iceberg) and other large enterprises and one of the national television channels were attacked," he said in an interview with Germany's ZDF, the NSDC press service reported on Wednesday.