The progressives laid out the proper course for us in Ukraine: "... we urge you to make vigorous diplomatic efforts in support of a negotiated settlement and ceasefire, engage in direct talks with Russia, explore prospects for a new European security arrangement acceptable to all parties.”
The Ukraine issue cannot be settled as an isolated matter. It can only be settled in the context of a broader agreement on security arrangements in the European theater.
With regard to Ukraine, everyone would remain in narrow focus on the specific issues and negotiations would inevitably bog down. In a grand settlement, on the other hand, everyone would gain from a military de-escalation in Europe, and Putin could legitimately claim to have acted in the interest of Russia. Here we have the win-win situation that is not available to us within Ukraine proper.