A prominent element of the U.K.’s Integrated Review is its “tilt” toward the Indo-Pacific. While the planned deployment of the U.K.’s aircraft carrier to the region is newsworthy, there is a lot more complexity beneath the surface of this eastward pivot. One feature, in particular, is the U.K.’s relationship with Japan.

Amid the slow-burning war in eastern Ukraine, one question has loomed: How will the U.S. and NATO respond if Russian troops cross back over the line dividing Ukrainian soldiers and Russian-backed separatists? With reports of a new buildup of Russian forces, Washington and Brussels may need quick answers soon.