British Prime Minister Boris Johnson's admission to intensive care with coronavirus prompted an outpouring of well-wishes from world leaders on Monday.
European Commission chief Ursula von der Leyen wished Johnson "a speedy and full recovery".
"My thoughts are with Prime Minister Boris Johnson and his family this evening," she tweeted.
Her reaction was echoed by the EU's Brexit negotiator Michel Barnier, who is recovering in quarantine after also testing positive.
"Wishing Boris Johnson all the best and a speedy recovery. My thoughts are with you and your family," Barnier tweeted.
The best wishes from two of the European Union's top officials underlined the setting aside of political tussling after Johnson took Britain out of the bloc in January.
French President Emmanuel Macron gave his "full support to Boris Johnson, his family and the British people at this difficult time".
"I hope he will rapidly overcome this ordeal," tweeted.
French Foreign Minister Jean-Yves Le Drian had earlier told BFMTV: "I know his strength, I am convinced he will draw from his resources, which are great, the capacity to overcome this ordeal. It's also symbolic of the seriousness of this crisis, which affects everyone."
Italy's Prime Minister Giuseppe Conte tweeted in English that "the Italian people is with the UK in these difficult times. We are one for each other. Get well soon Boris Johnson!"
World Health Organisation chief Tedros Adhanom Ghebreyesus said he was "thinking of my friend Boris Johnson tonight, and sending my and WHO's heartfelt good wishes as he battles the coronavirus."
Dutch Prime Minister Mark Rutte said that "on behalf of the Dutch cabinet, I wish Boris Johnson, his family and the British people lots of strength during this difficult time."
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