Sunak and Boris Johnson before him was talking plenty of smack about Putin before Ukraine and was actively supporting Zelensky. It was Johnson who convinced Zelensky to back away from peace talks with Russia and resume the war against them.
Johnson himself has been acting in some shady dealings with Russians based here in the UK.
Here's an example.
Baroness D'Souza questions some House of Lords appointments, including that of the newspaper owner.
www.bbc.co.uk
Could you imagine a son of a KGB agent, being elected to US Senate or Congress? Well, it happened here in the UK, despite the British Secret Service warning against the appointment, it was then overruled by the then Prime Minister, Boris Johnson