(CNN) With reports that violence in Ukraine isspreading beyond separatist-controlled areas, it is clear the so-called Minsk-II ceasefire between the Ukrainian government and pro-Russian rebels in the Donbas is teetering.
If the United States wants to avoid the prospect of the violence spilling over into a broader conflict, it will need to keep the option of more direct involvement — including the provision of arms — firmly on the table.
Until recently, the White House has understandably been focused on countering the rise of the Islamic State of Iraq and Syria, a reality that allowed the Europeans (especially Germany) to take the lead in crafting a response to Russia's aggression. But this U.S. reluctance to take center stage has allowed the Russians to exploit splits within Europe in the knowledge that the EU states would not fight force with force. […]
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