Extending Russia - Competing from Advantageous Ground

The Ukrainian military already is bleeding Russia in the Donbass region (and vice versa). Providing more U.S. military equipment and advice could lead Russia to increase its direct involvement in the conflict and the price it pays for it. Russia might respond by mounting a new offensive and seizing more Ukrainian territory. While this might increase Russia’s costs, it would also represent a setback for the United States, as well as for Ukraine.

Link here.