Yak 55 and Yak 18 T aerobatics:
Yak 18 T aerobatics!
Unlike 52s and 50s, there aren’t a lot of Yak 18Ts in the US, I understand only about 15 of them. I’ve only seen two or three. Like all Yaks they aren’t in any way FAA certified and are operated in Experimental Exhibition. Being aerobatic makes them a relatively easy fit into that category and nowadays the category has few restrictions on operation for most aircraft types, as long as you don’t want to fly outside the US, with easy maintenance that outside of annual condition inspections can be done by anybody. Any mechanic (no IA required) can do the condition inspections.
Most Wilgas are likewise in Experimental Exhibition but some do have an FAA type certificate, A55EU, because the Polish tried to market them here way back when. Those would have normal FAA certified maintenance, which isn’t E-EX but also isn’t terribly complicated. It’s interesting to consider the practicality of an American maintaining a Wilga on FAA registry in Romania. Except for what I imagine is a lack of FAA A&P mechanics it might be a simple option.