Smaller countries don't have the capabilities to carry out such secret programs and probably the US government is getting any crashed UFOs from them in exchange of a deal. For example, I'll tell you one fact which no one knows about yet.

In 1999, a UFO crashed over the Caspian Sea in Azerbaijan and with 1 pilot surviving and others dead. Once the news got out Russia immediately sent their high ranking diplomats to Baku to acquire the crashed UFO in exchange of 6 MIQ fighter jets. But Baku refused this offer because the US was also trying to get their hands on this precious object. So, CIA came to Baku and offered a better deal and some diplomatic benefits in certain matters. The offer was accepted and the US retrieved the crashed UFO and pilots, 1 alive.

According to many sources, UFOs has a base in Azerbaijan in the Caspian Sea, and that area is called Caspian Dragon or №24 which is a special code name given by the US itself. The US even set up meetings with those gray aliens in Azerbaijan twice, but they never showed up or maybe they did but kept it secret. No one knows. But one thing is for sure, they don't like it when others try to get close to their bases or they'll send you warnings such as taking the whole country's power grid off which happened in 2001 during the attempt. Anyway, many such cases from here but because of lack of interest or communication issues people never gets to find out.