The Ukrainian advances - if held - would be the most significant since Russia withdrew from near Kyiv in April.
Read moreBy Hugo Bachega in Kyiv and Matt Murphy in London
BBC News

The tech company presented a range of new devices at an event held at its California headquarters.

The tech company presented a range of new devices at an event held at its California headquarters.

Residents received a text to shut down non-essential power after record temperatures in the state.

The action has been taken for failure to respond to Freedom of Information requests on time.

Apple says it will appeal against Brazil's ban on the sale of iPhones that do not come with adapters.

The chain, run by Intercontinental Hotel Group, said its online services were facing disruptions.

The regulator found some children's business accounts had been set to public by default.

MrBeast fans flock to the grand opening of his first burger restaurant, in the US.

The tech company presented a range of new devices at an event held at its California headquarters.

Residents received a text to shut down non-essential power after record temperatures in the state.

The action has been taken for failure to respond to Freedom of Information requests on time.

Apple says it will appeal against Brazil's ban on the sale of iPhones that do not come with adapters.

The chain, run by Intercontinental Hotel Group, said its online services were facing disruptions.

The regulator found some children's business accounts had been set to public by default.

MrBeast fans flock to the grand opening of his first burger restaurant, in the US.

Residents received a text to shut down non-essential power after record temperatures in the state.

The action has been taken for failure to respond to Freedom of Information requests on time.

Apple says it will appeal against Brazil's ban on the sale of iPhones that do not come with adapters.
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