The King has praised the “determination and strength” of the Ukrainian people in a message marking the second anniversary of Russia’s invasion.

In a message released by Buckingham Palace, Charles said he was “greatly encouraged” by the UK’s efforts to support Ukraine and commended their “true valour”.

Saturday marks two years since the Kremlin launched its attack on Ukraine, starting the biggest incursion in a European country since the Second World War.

He said: “The determination and strength of the Ukrainian people continues to inspire, as the unprovoked attack on their land, their lives and livelihoods enters a third, tragic, year.

“Despite the tremendous hardship and pain inflicted upon them, Ukrainians continue to show the heroism with which the world associates them so closely.

“Theirs is true valour, in the face of indescribable aggression. I have felt this personally in the many meetings I have had with Ukrainians since the start of the war, from President Zelensky and Mrs Zelenska, to new army recruits training here in the United Kingdom.

“I continue to be greatly encouraged that the United Kingdom and our allies remain at the forefront of international efforts to support Ukraine at this time of such great suffering and need.

“My heart goes out to all those affected, as I remember them in my thoughts and prayers.”

Charles has undertaken many engagements in the UK linked to Ukraine since the war began, including visiting a training site for military recruits in Wiltshire.

He has met Ukrainian President Volodymyr Zelensky several times, including during his visit to the UK in February last year.

It was announced earlier this month that Charles had been diagnosed with a form of cancer, discovered while he was being treated in hospital for an enlarged prostate.

He has started a schedule of regular treatments but postponed all public-facing duties, spending much of his time at the royal residence in Sandringham, Norfolk.