That's what I've been trying to figure out. The Argentine navy is in pitiful condition. Their two submarines are laid up. They have maybe one real amphibious assault ship. Their four "destroyers" would be classed as light frigates by most other modern navies.
They have one amphibious cargo ship, which can carry four LCVPs and several rubber boats, and one destroyer-transport which can carry about 300 troops, two helicopters, and several rubber boats. So *at best* they could maybe lift one marine battalion, but they wouldn't be able to unload much of their heavy equipment unless they could somehow capture Port Stanley.
Their air force is similarly sad. Whatever attack planes they sent would be operating near the limits of their range, giving them little time on target and little fuel to spare for maneuvers.
All of the Mirages and Super Etandards, and most, if not all, of the Skyhawks, have been officially retired. The only combat aircraft they have that can fly are a couple of dozen light counter-insurgency Pucarás, which lack the range to reach the Falklands, unless they intend to fly one-way missions, land at remote airstrips in the islands, and hope they can recover the planes and crews later.
And they'd have to maneuver. The Falklands garrison now includes a
Type 45 destroyer. This is a potent, modern air defense platform. Even if the RAF remained entirely out of the fight, the Type 45 by itself guarantees that the outdated Argentine planes would never be able to achieve air superiority.
Due to the decision to cut Type 45 acquisitions from 12 to six, sometimes a Type 23 frigate is assigned. However, recent upgrades, including the CAMM which
Seismosaurus mentioned, have vastly increased the anti-air capabilities of the Type 23.
The weak Argentine naval surface force, consisting of a handful of clapped-out frigates and corvettes, and escorting their troop transport, would have to face off against the Type 45, an RN frigate, and probably one or more RN submarines. Assuming any Argentine ground troops made it ashore, they'd be confronted by a well-equipped, well-prepared, and well-entrenched enemy force.
Actually, it would be either a frigate or a destroyer, but the odds would still be very heavily in the RN's favor.
The Argentine troops would be stranded ashore, with no air support, no naval fire support, and no hope of resupply or reinforcement. With every passing day, their situation would worsen, and RN and RAF reinforcements would draw closer.
Assuming any even made it ashore.
Unless abaddon has a vastly different and better-documented assessment of current Argentine military strength, I don't see how they could today take the 1982-strength Falklands, let alone the 2017-strength Falklands.
They *might* be able to take the 1982-strength Falklands by sheer weight of numbers, but I wouldn't put money on it.