European leaders are expected to warn Russia that hostile action against Ukraine could come at a high price. The statement came amid concerns over the build-up of Russian forces on the Ukrainian border. The message, to be agreed during a European Council summit in Brussels, will be the latest warning from the West against Russian. However, the Kremlin denied it plans to attack. Meanwhile, Russia has set out its demands for security guarantees to the United States.<br />''<br />''Western intelligence services believe up to 100,000 Russian troops are near Ukraine's borders. Ukrainian authorities have said Moscow could be planning a military offensive at the end of January, although US officials say it is not yet clear whether President Putin has made a decision.<br />