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The audience will see the surprise arrival of Mulligan’s Nell coming like a warship on the horizon.

But he warned that the movement of Russian warships beyond the "eastern part of the Black Sea" would be treated as a violation of the agreement and a "threat to the national security of Ukraine".

UK warships have shadowed a Russian task group as it passed through British waters, the Royal Navy has said.

So important are these cables, which carry huge volumes of internet data between countries, that Nato has launched a mission called "Baltic Sentry", to patrol the Baltic Sea with aircraft, warships and drones.

Also signalling support was King Charles, who planted a red maple tree on the grounds of Buckingham Palace and wore his Canadian medals during a high profile visit to a naval warship.