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
Coronation Street actor Ryan Thomas is to quit the show after more than 15 years.
Fresh violence has erupted in the West Bank following the death of a 13-year-old boy, sparking fears of a new Palestinian uprising.
A family dog was 'best man' as he stood by a wounded veteran's side when he married his school sweetheart.