A post marks the beginning of Polish territory on its border with Lithuania. The nearly 50-mile stretch of Polish-Lithuanian border sandwiched between the Russian enclave of Kaliningrad and Belarus is known as the Suwalki Gap.
(JANEK SKARZYNSKI/AFP/Getty Images)
The U.S. and its NATO allies are looking for new ways to deter Russian aggression against the Baltic states. But policymakers and defense planners have yet to agree on Moscow's intentions in the region....