Anti-Putin émigré group claims its fighters crossed into Russia after Kyiv dismisses reports as ‘false flag’ attack

• Russia-Ukraine war – latest news updates

The Kremlin has claimed Russia has been attacked by “terrorists” after conflicting reports of firefights emerged from the Bryansk and Kursk regions, which Russian media blamed on Ukrainian “sabotage groups” and Ukrainian sources called a “provocation”.

The reports of fighting in Russia near the Ukrainian border began on Thursday morning. The head of the Bryansk region claimed that a “sabotage group opened fire on a moving automobile. As a result, one resident was killed; a 10-year-old child was injured.”

US secretary of state speaks to Russian foreign minister in what is believed to be their first one-on-one conversation since invasion of Ukraine. This live blog is closed

Olena Zelenska, Ukraine’s first lady, has tweeted about the overnight attack on Zaporizhzhia, writing:

Zaporizhzhia bravely resists the Russian aggressor. In retaliation, it attacks civilians. A high-rise building was deliberately hit last night. Three floors are completely destroyed. People died. We continue to search under the rubble. My condolences to the victims. We will not forgive this.

This is Martin Belam taking over the live blog in London. You can contact me at martin.belam@theguardian.com.

Investigators say sites set up during occupation of Ukrainian city were part of ‘calculated plan to terrorise’ locals

Evidence collected from Kherson in southern Ukraine shows Russian torture centres were not “random” but instead planned and directly financed by the Russian state, according to a team of Ukrainian and international lawyers headed by a UK barrister.

The city was under Russian control for eight months, from 2 March last year until Ukrainian forces entered the city on 11 November.