“Fernández has signalled that Argentina will return to its alignment with the left-wing governments of Latin America. That could see closer ties with Mexico and Venezuela, and greater tensions with Brazil, the region’s biggest economy.” https://www.batimes.com.ar/news/argentina/fernandez-to-shift-stances-on-latin-america-us-venezuela-brazil-china.phtml

“If Fernández weakens ties with the US, it could also give an opportunity for China to come in and send more defence equipment to Argentina.”

China might sell Argentina missile corvettes, tanks, armored personnel carriers, fourth-generation fighter aircraft and short-range ballistic missiles: https://nationalinterest.org/blog/buzz/could-china-help-ignite-second-war-over-falkland-islands-31197

China might also want a Second Falklands War:

“By enabling a war leading to an Argentine victory, or by even forcing London into a long surrender, Latin America would enter a new historic period in which Beijing's strategic preferences may begin to displace those of Washington.”

With air and naval forces in Argentina, China could reduce the US Navy’s ability to operate around Cape Horn.

Argentina also wants the Falklands:

https://en.mercopress.com/2019/10/31/fernandez-thanks-johnson-s-message-but-insists-he-will-claim-falklands-sovereignty