Russia has accused Ukraine of "nuclear terrorism" after blaming Kyiv for shelling at Europe's biggest power plant.
The Russian defence minister, Sergei Shoigu, warned that Ukraine risked a Chernobyl-style catastrophe by using Western-supplied weapons to attack the Zaporizhzhia nuclear power plant.
Ukraine and Russia have traded blame over shelling at Zaporizhzhia in recent months. Reports from independent organisations have been unable to verify either side's claims.