The war in Ukraine marks a new era of instability in Europe. Countering Russia’s efforts will require a stronger, more coordinated NATO.

The Donald J. Trump administration should place energy-sector reform at the center of its relationship with Ukraine. Doing so would constitute a low-risk, high-reward strategy for Washington to counter Moscow’s influence at the NATO border.

Overview Ukraine faces two severe and immediate challenges: armed pro-Russian separatists in the eastern part of the country and a sharp, nationwide economic deterioration stemming in no small par…

Overview In the past, conventional militaries were plagued by wartime oil shortages that severely undermined their battlefield effectiveness. But could oil shortages threaten military effectivenes…