Is Biden right to send tanks to Ukraine? Our panel reacts

As the war continues to slowly escalate, the question remains: how does this end?

These tanks aren't going to help end the war any time soon. Hopefully, they are intended to build up Kyiv's negotiating position and this might encourage the Kremlin to rethink its extreme war aims, thus moving this war toward a negotiated endgame. But the Ukrainians are likely to see the decision as a western endorsement of their aim of beating Russia definitively on the battlefield. This works against diplomacy and tends to draw the war out.

Christopher S Chivvis is a senior fellow and director of the Carnegie Endowment's American statecraft program

Matthew Duss is a visiting scholar in the American Statecraft program at the Carnegie Endowment. He is the former foreign policy adviser to Bernie Sanders

The Rev William Barber is president of Repairers of the Breach and founding director of the Center for Public Theology and Public Policy at Yale University

Phyllis Bennis directs the New Internationalism Project at Institute for Policy Studies