WASHINGTON — The willingness of United Launch Alliance’s parent companies to fund a next-generation rocket hinges on winning relief from the ban on the Russian-made engine that powers its current government workhorse, the Atlas 5, ULA executives say.

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Warren Ferster is the Editor-in-Chief of SpaceNews and is responsible for all the news and editorial coverage in the weekly newspaper, the spacenews.com Web site and variety of specialty publications such as show dailies. He manages a staff of seven reporters...