Sharply higher interest rates around the world could combine with weaker growth in emerging markets to slice as much as 2 percentage points off global growth in the next five years, the International Monetary Fund said on Tuesday. In a report assessing how individual national policies could interact to undermine the world economy, the IMF also warned the conflict between Russia and Ukraine could reverberate to the rest of the region if sanctions against Russia escalate, hitting natural gas supplies to Europe and weakening European banks.