AP Photo

Vice President Joseph Biden's trip to eastern Europe this week provides an important opportunity to reassure Poland, the Czech Republic, and Romania that the US is committed to their security.

This reassurance is needed, especially in the wake of the Obama administration's controversial decision to cancel the deployment of missile defense installations in Poland and the Czech Republic – Although President Obama's decision to scrap the Bush missile plan was the right one from a military and strategic point of view, the public rollout was less than ideal.

Polish and Czech leaders were informed of the decision only at the last second, making them feel like dispensable...