The "president" of the unrecognised territory of Liberland, Vit Jedlicka, has been visiting another unrecognised republic, Somaliland, for talks about mutual recognition.
The Somaliland foreign ministry tweeted that the two sides had discussed how to "strengthen cooperation".
Liberland is a 7 sq km (2.5 sq mile) area of uninhabited marshland between Serbia and Croatia. In the summer of 2015, Mr Jedlicka, his girlfriend and a couple of friends planted a flag there. The other three elected him president.
Since then, he has signed up hundreds of thousands of would-be citizens online. He has appointed a cabinet and ambassadors-in-waiting worldwide. He has money from crowdfunding and wealthy libertarian donors. He has printed diplomatic passports.
But Mr Jedlicka, and anyone else, is banned from setting foot in Liberland.
In 2015, Liberland seemed to be a rare example of what the law calls terra nullius - land claimed by no state. It was once part of Serbia, but when the borders were redrawn at the end of the Yugoslav civil war in the 1990s, it ended up with Croatia.
But Croatia didn't want it. If it had accepted it, it would have had to accept the new borders, which gave it less territory than before.