Russian forces have ‘upper hand’ in Donbas fighting, Ukrainian officials say

Governor of Luhansk says Ukrainian troops retreating in some areas, as city of Lyman reportedly captured

• Ukraine-Russia war - latest updates

Officials in Ukraine have admitted that Russia has the upper hand" in fighting in the country's east, as Ukrainian forces fell back from some of their positions in the Donbas region.

Amid reports that Lyman, the site of an important railway junction, had largely been taken by Russian forces, Ukraine's general staff reported that Russian forces were also advancing on Sievierodonetsk, Bakhmut and Avdiivka.