"We all heard this news (of Johnson's resignation) with sadness. Not only me, but also the entire Ukrainian society, which is very sympathetic to you," Zelenskiy's office said in a statement after the two leaders spoke by phone.

"We have no doubt that Great Britain's support will be preserved, but your personal leadership and charisma made it special."

(Reporting by Max Hunder, Writing by Alexander Winning, Editing by Timothy Heritage)