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Denmark, which oversees Greenland’s administration, hasn’t kept Greenland “safe from a lot of very aggressive incursions from Russia, China and other nations,” he added.

Last month, South Korea's intelligence agency said North Korea had sent more soldiers to Russia and re-deployed others to the frontline in the western Kursk region where Ukraine launched a lightning incursion.

Now the positions are reversed, with Estonian troops and their Nato allies training here to prevent a Russian incursion.

But he believes Ukraine's surprise incursion into Russian territory, launched last August, was too deep and too narrow - relying on just one main road for supplies and reinforcements.

He'd also destabilise the wider Baltics, probably socially, politically, and economically, as a Russian incursion – however limited – would likely put off foreign investors viewing this as a stable region.