China has supported Argentina's claim to the Falkland Islands.
In 1982, when Argentina was ruled by murderous generals,
supported by the US,
they sent troops to seize the Falkland Islands, very much against
the wishes of the British-descended people who lived there. The UK
sent a fleet to liberate them.
The generals had used nationalism as a tool to distract the Argentine
people from their crimes, but after losing the war, they couldn't hold
on and Argentina became a democracy.
China's motive for taking a side in this dispute is surely to win
Argentina's support in the new cold war. However, comparing the
Falkland Islands to Taiwan is morally accurate. China wants to do to
Taiwan the same thing that the Argentine generals did to the Falkland
Islands: conquer and permanently rule an unwilling people.