Russia, which has stationed some 150,000 soldiers around Ukraine's northern and eastern borders, is demanding a guarantee that Ukraine never be allowed to join the NATO alliance, something President Vladimir Putin says is essential to Russia's long term security.
But Von der Leyen, who heads the 27-member European Union's executive, said Russia's reliance on fossil fuel exports was its weakness. "They make up two thirds of its exports, and half of the Russia budget comes from them," she said. Russia needed to modernise, and "precisely that would no longer be possible" if further sanctions were raised.