International Atomic Energy Agency director-general Rafael Grossi has reiterated his concern about the difficult work conditions at the Chernobyl nuclear power station, where it remained unclear when the next staff rotation might take place, almost a week after the most recent turnover of technical personnel at the site.

Mr Grossi said the IAEA continued to monitor the situation, following media reports of activities of Russian military forces in and around Slavutych, where many staff live, because of the impact it could have on their ability to get to and from work.

Ukraine told the IAEA over the weekend that in the northeastern city of Kharkiv, a nuclear research facility had come under renewed fire but it was not yet possible to assess the damage.