Shocked by a surprise U.S. agreement with Russia concerning diesel supplies, officials across Europe and the United Kingdom have coalesced around a cautious diplomatic message. The pact has drawn sharp condemnation from Ukraine, where leaders have openly characterized the arrangement as a significant gift to Russian President Vladimir Putin. European capitals are now grappling with the geopolitical fallout of the unexpected deal, balancing transatlantic alliances with deep anxieties over the renewed economic engagement with Moscow.