Iron diplomacy
"Iron diplomacy" (Ukrainian: залізна дипломатія, romanized: zalizna dyplomatiia) refers to the practice of transporting world leaders from Poland through Ukraine via rail since the start of the Russian invasion of Ukraine in 2022. The expression was coined by Oleksandr Kamyshin, the head of Ukrainian Railways, because many diplomats were being shuttled by train to and from Kyiv, the capital city, as the use of Ukrainian airspace was impractical due to the invasion.