Two civilians have been killed during fighting in Donetsk.
Ukrainian forces have now seized control of the city's airport after vowing to press on with a military offensive "until not a single terrorist" was left.
More than 30 rebels are thought to have died in the clashes.
More top news
The Prime Minister will say Moscow's brazen flouting of international law represents a threat to the basis of democracy across Europe.
In some cases, victims of violence and other serious crimes face long delays as forces are unable to dispatch officers promptly.
Mr Corbyn will highlight increases of almost 6% in council tax bills across the country.