Sullivan & Cromwell LLP partner H. Rodgin Cohen doesn't think Greece's financial woes create a contagion risk for the United States. Says Cohen, the U.S. is "insulated from the direct and immediate problems." Cohen says that the focus in Europe right now should be to "shore up" medium-sized banks and resolve the "gaping holes in those balance sheets." For more from Rodgin Cohen, watch "H. Rodgin Cohen's concerns about Volcker Rule." - Katie Roof