When Vladimir Putin invaded Ukraine at the end of February, he said he was responding to Nato expansion and trying to deter other countries from joining that alliance. (Subscribe: https://bit.ly/C4_News_Subscribe)

Yet the very opposite appears to be happening - as Finland, a once neutral neighbour, took a big step towards joining.

Finland's leaders say they want to join Nato as quickly as possible - and if that happens - the western military alliance will more than double the length of its land border with Russia - given that Finland shares an 830-mile frontier with Russia.

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