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As long as a pro-Russian government held sway in Kiev, the Russians could be confident that its buffer zone would remain intact and guard the North European Plain. Even a studiedly neutral Ukraine, which would promise not to join the EU or NATO and to uphold the lease Russia had on the warm-water port at Sevastopol in Crimea, would be acceptable. That Ukraine was reliant on Russia for energy also made its increasingly neutral stance acceptable, albeit irritating. But a pro-Western Ukraine with ambitions to join the two great Western alliances, and which threw into doubt Russia's access to its Black Sea port? A Ukraine that one day might even host a NATO naval base? That could not stand.