The head of the U.K.'s National Cyber Security Centre warns that hostile nations like Russia, Iran and China are behind the most serious cyberattacks in the U.K. In a speech Wednesday, Richard Horne said British businesses need to prepare for large-scale cyberattacks, especially if the U.K. becomes involved in international conflicts.

Six Bulgarian nationals have been sentenced in a London court to up to nearly 11 years in prison for spying for Russia.

He said local authorities had struck a deal with the British government on financial support for the area to accompany the measures. Instead, it has adopted a three-tier system for England, with areas classed as medium, high or very high virus risk. The measures have caused tension between Johnson’s Conservative government and local authorities in northern England, which has the country’s highest infection rates. Wednesday’s announcement about South Yorkshire means 7.3 million people, or 13% of England’s population, have been placed under the toughest restrictions — all of them in the north. Communities Secretary Robert Jenrick said Burnham had rejected an offer of 60 million pounds ($78 million) in additional funding.