Ukraine has officially ceased the transit of Russian gas to Europe as the existing contract expired, bringing an end to over three decades of gas flow through its territory. The decision, made for national security reasons, has left Europe facing gas supply uncertainties and rising prices. This move comes amidst escalating tensions between Ukraine and Slovakia, with threats exchanged regarding energy supplies. As the gas flow has dropped to zero, analysts predict significant economic implications for Russia, which stands to lose substantial revenue. The situation emphasizes the ongoing energy crisis in Europe, especially as countries scramble to secure alternative energy sources in light of the halted supplies.