IAEA finds Russian mines at Ukraine nuclear plant, seeks full access

Anti-personnel mines found at Zaporizhzhia nuclear plant in violation of safety standards.
Mines do not currently pose risk to nuclear safety but create psychological pressure on staff.
IAEA has been denied access to certain areas at Zaporizhzhia by Russian forces.
Ukraine and Russia accuse each other of planning provocation at nuclear plant.
One Zaporizhzhia reactor switched to "hot shutdown" mode, raising safety concerns.