A statement to the Washington Post from Energy Department spokesperson Shalylyn Nynes reads:
"These individuals are known for pranking high-level officials and celebrities, particularly those who are supportive of an agenda that is not in line with their governments. In this case, the energy security of Ukraine."
As secretary of energy, Rick Perry is responsible for the security of much of the United States’ nuclear materials, as well as the cybersecurity of the American energy grid, among other objectively serious tasks.
Perry and the “Ukranian Prime Minister” spoke about a wide variety of topics. The Washington Post reports that the three touched on a pipeline in the Baltic Sea, cyberattacks on the American power grid, the United States' withdrawal from the Paris Climate Accord, and a new fuel source derived from moonshine and pig manure.