The Ukraine crisis is here to stay.

President Vladimir Putin of Russia is increasingly staking his legacy on reversing Ukraine’s pro-Western shift. Even if he does not order an invasion this winter, he is making clear that he will keep the pressure on, backed by the threat of force, for as long as it takes to get his way.

But Ukraine’s leaders have so far refused to compromise on Putin’s terms, and the West sees the Kremlin’s demand for a Russian sphere of influence in Eastern Europe as a nonstarter. That leaves the best-case scenario as a long and dangerous diplomatic slog toward a difficult settlement — a process that could consume Western resources and attention for many months.