Ukraine, as a member of the former Soviet Union, currently uses 1,520-millimeter-wide train tracks throughout the country, as is standard in Russia. This consistency has allowed Moscow to transport personnel and supplies to Ukraine smoothly during their invasion efforts. On the other hand, Poland and other Western European countries rely on 1,435-mm-wide rails--as do Japan's Shinkansen. The difference in track standards forces passengers and cargo to change trains on trips between Ukraine and its Western neighbours. In May last year, Ukrainian Prime Minister Denys Shmyhal announced plans to change the country's rail width to meet the European criteria. The decision to improve passengers' accessibility to the Western states and reduce Moscow's clout was critical to the envisioned rebuilding of Ukraine's railway network--and makes Japan's Shinkansen, running on its 1,435-mm tracks, ideal candidates for the project.