I went to a talk at Oak Ridge National Lab soon after the discovery of Ununseptium (element 117 that is now called Tennessine) and it was really interesting the international collaboration needed to make the discovery happen.

Basically, at Oak Ridge they produced radioactive isotopes with the appropriate number of neutrons and protons to match the theoretical ratio of the atom. Then, those isotopes needed to be shipped to Russia so they could be smashed together in a particle accelerator to briefly create the atom which we know existed from its specific decay and gamma ray emission.

But there was a lot of political hurdles in the way of shipping the isotopes to Russia in the first place, and it almost didn't happen because the isotopes were decaying while paperwork was floundering between state departments.