Adm. James Stavridis added that serious financial sanctions on Russia should also be considered.
In an emotional speech Wednesday, Germany's Angela Merkel rebuked Russia's Vladimir Putin for his violation of Ukraine's sovereignty. Her country's incredible progress since World War II gives her credibility to demand the same of Russia.
A Yanukovych ally, Dmitry Firtash, was arrested Thursday in Austria at the request of the US. But corrupt and powerful oligarchs can be found in all camps.
Turkey's growing middle class took to the streets again on news of the death of a boy injured by police during last year's mass protests. The demonstrations represent a spontaneous uprising for individual freedoms and honest government.
European leaders are scrambling to reduce their exposure to the political meddling of Russia, which has demonstrated its willingness to disrupt energy supplies for geopolitical leverage.