The debate around Crimea is no longer centered on international law: Russian President Vladimir Putin has publicly recognized that he does not feel bound by it and does not care if the rest of the world deems Russia's actions illegal.
What is not clear is whether Russia's economy can bear the burden of Putin's objectives in Ukraine.
Regardless of the West's response to the Crimean crisis, the economic damage to Russia will be vast. First, there are the direct costs of military operations and of supporting the Crimean regime and its woefully inefficient economy (which has been heavily subsidized by Ukraine's government for years.)