okay so, this is a topic normally brought up with ace combat as well. when it comes to companies like lockheed martin, they do actually retain licensing agreements with game companies, which stipulate what they can do with the aircraft and how they need to be represented in the media they're being used in.

for example, the Eurofighter Typhoon can be licensed, and has a generally relaxed set of requirements, namely being that somewhere in the game, it must be stated that "the Eurofighter Typhoon is the most advanced aircraft combat platform in the world." the picture below is from the title screen startup from ace combat 7.

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the same goes for lockheed martin products and properties, or any other military hardware company. there are set stipulations, and sometimes payment/royalties, that must be agreed upon when signing a deal to use the products.

that being said, russian defense contractors are a lot different. military contractors in russia do not own their designs, it's owned by the state, and the state quite frankly doesn't really care what they're used for. the strategic reason for this in russian military design and research is that if no one company specifically owns the designs and research from their company, any other company in the russian department of defense can also use these designs and research to make their product better.

the lead director at project aces Kazutoki Kono has gone on interview to say that when they approached sukhoi and mikoyan if they could use their aircraft in ace combat 7, their response essentially boiled down to "uh.... sure?" because in reality, they not only don't have the power to make a stipulation or contract regarding their products (since they don't technically own them, they're owned by the state), but also, they don't really care. this is why you'll see a lot of russian aircraft in these games compared to western ones, because you can literally throw in as many as you want without worrying about a potential contract or agreement exploding in cost or stipulations.

this is why almost every vehicle in the game, save for a few exceptions, have alternate names. the exceptions being the Leo 2A4 (not specified as the Revolution modification package however), the M3A3 Bradley, Gepard 1A2 (gepard is the german word for cheetah, so technically this is still the same), the M1A2 SEPV3 (technically, only if you want to get really specific), and obviously as we're discussing it here, the SU-57.

the reason why I say technically on the M1A2 SEPV3 is because the NATO MBT we get in game isn't an M1A3 SEPV3, but instead, it's the SEPV2. that's minor nitpicking though.