The UN's nuclear watchdog has finally gained access to the Russian-held Zaporizhzhia power plant in Ukraine - but few details emerged on Thursday of what they had discovered.

The inspectors from the International Atomic Energy Agency spent a few hours at the plant, after a risky journey delayed by shelling near the site.

However, it's not yet clear which parts of the facility they were able to visit, or whether they were able to interview the Ukrainian technicians who are still operating the station.

Zaporizhzhia is Europe's largest nuclear plant. Russia and Ukraine have blamed each other for shelling at the plant, prompting warnings an accident could cause a nuclear disaster.

A top Russian business executive has become the latest to die in mysterious circumstances.

Ravil Maganov, the chairman of Russia's second-largest oil producer Lukoil, is reported to have fallen from a hospital window in Moscow.

The company confirmed his death, but said only that Maganov, 67, had "passed away following a severe illness".

Russian media said he was being treated at Moscow's Central Clinical Hospital and died of his injuries.

Shortly after Russia invaded Ukraine, the Lukoil board called for the conflict to end as soon as possible, expressing its sympathy to victims of "this tragedy".