© Heidi Levine for The Washington Post Young men swim in the Dnieper River from the Zaporizhzhia nuclear complex, which is under the control of Russian forces. Ukraine’s top military chief warned Wednesday that a “limited” nuclear war between Russia and the West cannot be discounted, a scenario with grave global implications. Zaluzhny’s warning follows weeks of international alarm over a potential disaster at Europe’s largest nuclear facility, the Zaporizhzhia nuclear power plant in southeastern Ukraine. The U.N. atomic watchdog agency on Tuesday called for a safe zone there to prevent a nuclear catastrophe. But Washington and its European allies have categorically rejected providing Ukraine any military support that could draw it into a direct confrontation with Russia.