Yatsenyuk requires from "Gazprom" to return the $ 16 billion

As the Prime Minister Arseniy Yatsenyuk, Kyiv sent claims to "Gazprom" in the Stockholm arbitration court demanding the return of $ 16 billion allegedly overpaid for gas transit.

However, "Russia has also filed lawsuits against Ukraine on charging with Ukraine $ 27 billion in so-called contract clause" take or pay "

The basis of both lawsuits were previously concluded contracts.