Zelenskiy said about 100 civilians evacuated after weeks sheltering in the Azovstal complex would arrive in Zaporizhzhia on Monday

• Russia-Ukraine war: latest updates

Ukrainian authorities are planning to evacuate more civilians from Mariupol on Monday, after dozens were finally brought to safety following weeks trapped under heavy fire in the strategic port city’s Azovstal steel complex.

The civilians had been sheltering in bunkers beneath the steelworks that is the last redoubt for Ukrainian forces in Mariupol.

Two explosions were reported in the early hours of Monday in Belgorod, the southern Russian region bordering Ukraine. Vyacheslav Gladkov, the region’s governor, said in a social media post there were no casualties or damage. On Sunday Gladkov had said one person was injured in a fire at a Russian defence ministry facility in Belgorod, while seven homes had been damaged.

Russia’s top uniformed officer, General Valery Gerasimov, visited dangerous frontline positions in eastern Ukraine last week in a bid to reinvigorate the Russian offensive there, the New York Times has reported citing Ukrainian and US officials. The Guardian could not immediately confirm the report.

Russia’s foreign minister, Sergei Lavrov, said that the county is working to prevent nuclear war, Reuters reported. In an interview with Italian TV, Lavrov said: “Western media misrepresent Russian threats. Russia has never interrupted efforts to reach agreements that guarantee that a nuclear war never develops”.