Gas Pipelines Cross a River near Ivano-Frankvisk, Ukraine

Gas Pipelines Cross a River near Ivano-Frankvisk, Ukraine

Vincent Mundy/Bloomberg

Sections of the Bratstvo, top, and Soyuz gas pipelines cross a river near Ivano-Frankvisk. Ukraine is also critical to Europe’s energy security because about 15 percent of its gas supplies travels through its Soviet-era pipeline network.