Argentina's foreign minister Hector Timerman clashed with MPs when he appeared before the all-party group on Argentina.
Mr Timerman told the MPs that Argentina would not recognise a referendum of the islanders planned for next month on whether they want to remain part of the UK. He said:
The self-determination referendum doesn't apply to the Malvinas. It is not a colonised people, it is a colonised territory.
It is not a matter for negotiation. Not one single country in the world recognises the sovereignty of the United Kingdom in the Malvinas.
We have to respect the interests of the people living in the area but not the wishes.
More top news
With the introduction of an anti-subversion law just weeks away many fear their freedoms will soon be stripped away, writes Debi Edward.
German prosecutors believe Madeleine is dead and are investigating the child sex predator on suspicion of her murder.
Felix Khor was given a 15% chance of survival from Covid-19.