KYIV, April 10 – The national power grid Ukrenergo officially notified Russia about the start of the investment litigation regarding the company's assets seized in Crimea, Ukrenergo CEO Vsevolod Kovalchuk said.

"A few days ago, Ukrenergo handed Russia a formal written notice of the investment litigation regarding the assets of our company in the Crimea. The envelopes were received by Foreign Minister Sergei Lavrov, Finance Minister Anton Siluanov, Justice Minister Alexander Konovalov, Prime Minister Dmitry Medvedev and Russian President Vladimir Putin," he wrote on his Facebook page.