The United States will announce potentially severe new sanctions and export controls against Russia on Tuesday in response to Moscow’s decision to recognize two breakaway regions of Ukraine as independent and send troops there. Russian PresidentVladimir Putin on Monday told Russia’s defense ministry to deploy forces into the two regions to “keep the peace,” defying Western warnings that such a step would be illegal and wreck peace negotiations. “The United States will impose sanctions on Russia for this clear violation of international law and Ukraine sovereignty and territorial integrity,” US…