Ukrainian offensive is under way, says Putin – as it happened

Russian president says beginning of offensive is evidenced by the use of strategic reserves'. This live blog is closed

• Seismic data adds to evidence Ukraine's Kakhovka dam was blown up

Russian military bloggers are saying that overnight the Ukrainians were making another attempt to break through Russian lines in occupied Zaporizhzhia in the area of Orikhiv.

The claims have not been independently verified.