"The world cannot just allow this to happen," Hague said, but he ruled out any military action. "The U.K is not discussing military options. Our concentration is on diplomatic and economic pressure."
Ukraine is also struggling on the financial front. The treasury is almost empty and its currency is under pressure after years of running large deficits. The International Monetary Fund said a fact-finding mission would visit Ukraine starting Tuesday for 10 days. Ukraine has asked the IMF for rescue loans and says it needs $35 billion to pay its bills over the next two years.
Market reaction to the Russian invasion of Crimea was immediate Monday. In European trading, gold and oil rose while the euro and stock markets fell. The greatest impact was felt in Moscow, where the main RTS index was down 12 percent at 1,115 and the dollar spiked to an all-time high of 37 rubles.
The U.N. Security Council has scheduled an open meeting on the crisis in Ukraine.