When Nigel Farage’s Reform UK is just one point behind you in the opinion polls, the last thing you want to be reminded about is Brexit.

If you’re Sir Keir Starmer, that is.

No doubt Poland’s prime minister, Donald Tusk, was trying to be friendly. After all, as Sir Keir said, they share a passion for Arsenal Football Club.

But when Mr Tusk declared at their joint news conference in Warsaw that his dream was “instead of a Brexit, we will have a Breturn”, Sir Keir visibly cringed.

Was it an ambush? Not quite. But it was certainly awkward for the UK prime minister. He stood stiffly and didn’t respond, not once uttering the word “Brexit”.

Mr Tusk, however, has form for bemoaning Brexit. He was, after all, the president of the European Council when the UK voted to leave the EU in 2016.

He might now be in his second spell as Poland’s PM, but his five years at the EU make him the ultimate Brussels insider, who’s never made any attempt to hide his feelings on Brexit.

Prior to the UK referendum, in September 2015, he said Brexit “could be the beginning of the destruction of not only the EU but also of western political civilisation in its entirety”.

His most outspoken attack on the UK’s Eurosceptics came in 2019 when the-then prime minister Theresa May was struggling to get a deal. He spoke of “what the special place in hell looks like for those who promoted Brexit“.

Standing alongside Sir Keir, he revealed that “for obvious reasons” they discussed co-operation between the UK and the EU. He recalled that his emotional reaction to the referendum in 2016 was “I already miss you”.

He went on: “This is not just about emotions and sentiments – I am aware this is a dream of mine, that instead of a Brexit we will have a Breturn.

“Perhaps I’m labouring under an illusion. I’d rather be an optimist and harbour these dreams in my heart – sometimes they come true in politics.”

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A dream? Or a calculated move? As a Brussels insider, was Mr Tusk speaking for the EU as a whole? Was he doing Brussels’ bidding?

He may have returned to lead his homeland, but he remains a key player in Brussels.

On becoming Poland’s PM in 2023, he ended a dispute with Brussels which unlocked billions of frozen EU funds for his country.

He also orchestrated the return of his centre-right ally Ursula von der Leyen as European Commission president.

And Poland has just taken over the rotating presidency of the EU, which means Mr Tusk will be hugely influential once again, chairing meetings and setting agendas.

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Poland is back in the European mainstream. It’s where Mr Tusk would like the UK to be as well.

It’s where, privately, Sir Keir would like the UK to be. It’s just that with Reform UK almost neck and neck with Labour in the polls, he daren’t say so.