Oksana Baulina had been reporting from Kyiv and the western city of Lviv for investigative website The Insider, the outlet said in a statement.

She died while filming damage in the city's Podil district, it added.

Baulina previously worked for Russian opposition figure Alexei Navalny's anti-corruption foundation, and had left Russia.

Last year the foundation was made illegal and branded extremist by the authorities, forcing many of its staff to flee abroad.

One other person was reportedly killed and two injured in the shelling.

Baulina had previously sent several reports from Kyiv and the western Ukrainian city of Lviv, The Insider said.

The publication expressed its "deepest condolences" to the reporter's family and friends.

Investigative journalist Alexey Kovalyov paid tribute to Baulina.

Baulina is one of at least seven journalists known to have been killed in a month of war.

The Press Emblem campaign reports that Ukrainian journalist Shakirov Dilerbek Shukurovych was killed on 26 February, two days after the invasion began.

Then in early March Yevhenii Sakun, a camera operator for Ukrainian TV channel LIVE who also worked for the Spanish news agency EFE, died during shelling of the TV transmission tower in Kyiv.

Investigative journalist Viktor Dudar was killed on the front line during a battle with Russian troops near the southern city of Mykolaiv, Ukrainian reports said.

Two weeks later, US journalist and filmmaker Brent Renaud, 50, was shot dead as he was filming in the town of Irpin outside Kyiv.

Two Fox News journalists - cameraman Pierre Zakrzewski, 55, and Oleksandra Kuvshinova, 24 - also lost their lives when their vehicle was struck by incoming fire on the outskirts of Kyiv.