Those who do not study history are doomed to repeat it...

...specifically, the Argentinian diplomats who are optimistic about enlisting Plaid Cymru support for their claim on the Falklands (based on the Welsh emigration to Argentina many decades ago) should have read up on the Bluff Cove attack on Sir Galahad where a large number of Welsh Guardsmen were killed.

Sure enough, it seems that Plaid Cymru weren't that interested:

Mr Llwyd confirmed the meeting had taken place, but he said he firmly rebuffed the approach to join Argentina's campaign.
He told The Daily Telegraph that he had "no interest" in helping the South American country with its battle to win support for its claim to the islands.

There's a politician who can recognise a millstone before someone tries to hang it around his neck.