“[I will] not co-operate on [a] no-deal.”
Brexit: Donald Tusk and Boris Johnson clash over who is 'Mr No Deal' https://www.bbc.co.uk/news/uk-politics-49458293 BBC News (24 August 2019)
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Donald Tusk 14
Polish politician, current President of the European Council 1957Related quotes

“The only thing that will redeem mankind is co-operation”
Source: 1950s, Human Society in Ethics and Politics (1954), p. 212
Context: The only thing that will redeem mankind is co-operation, and the first step towards co-operation lies in the hearts of individuals.

“I dont work with collectives. I don't consult, i don't co-operate, I don't collaborate.”
Source: The Fountainhead

Source: The Principles of Ethics (1897), Part I: The Data of Ethics, Ch. 8, The Sociological View

Source: 1910s, Mysticism and Logic and Other Essays http://archive.org/stream/mysticism00russuoft/mysticism00russuoft_djvu.txt (1918), Ch. 6: On the Scientific Method in Philosophy

Quoted in Bear Grylls impressed with Modi’s 'humility'; says PM calm during crisis, agreed to sit in homemade raft https://economictimes.indiatimes.com/magazines/panache/bear-grylls-impressed-with-modis-humility-says-pm-calm-during-crisis-agreed-to-sit-in-homemade-raft/articleshow/70615908.cms Bear Grylls
2019

Prime Minister
Source: Remarks to the Cabinet on official pay policy (20 July 1978), quoted in Tony Benn, Conflicts of Interest: Diaries 1977–80 (1990), p. 326

Press Information Bureau in: Address By His Excellency Shri K.R. Narayanan, President Of The Republic Of India At Peking University http://pib.myiris.com/speech/article.php3?fl=010508171719, press Information Bureau, 30 May 2000