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What sanctions it would take to persuade Russia to change course.
The Russian government faces many costs including the bill for infrastructure upgrades, increased salaries and pensions for officials.
Growth has slowed and could drop to zero within months, Russian politicians admit.
"Ukraine needs help from abroad, that's what the interim government knows."
Christine Lagarde on Congress' IMF vote: "Not exercising that leadership is a mistake."
Why American companies in Russia may be on alert for further deterioration between Washington and Moscow.
New Cold War? What new Cold War?
The BBC's Natalia Antelava on the mood at the Crimean markets
The Soviet-born author remembers spending family time in Crimea.
With Russia seizing control in Southern Ukraine, some of the geo-economics of the tension.
