In the Assault Horizon timeline, the CFA-44 was built by the Soviet Union (NATO codename: Fandance). As for the rest we'll have to see if they appear in Ace Combat Infinity. The Morgan is there but it just generically refers to its origins as "a certain country".
A lot have people have said that the Morgan has Sukhoi-ish qualities. Also it was probably created by a country within USEA since the description says it was captured by Allied Forces, so I'd say it could very well be Russian. However that's all speculation.