Russian forces have occupied the regional administration building in Ukraine's port city of Kherson, regional governor Hennadiy Laguta said in an online post on Thursday.

Russia's defense ministry said it had captured Kherson on Wednesday but Ukraine has said its forces continue to defend the Black Sea port of about 250,000 people

A Ukrainian delegation had left for a second round of talks with Russian officials on a ceasefire, Ukrainian presidential adviser Mykhailo Podolyak said.