Budapest all major European roads and European railway lines lead to Budapest. The Danube was and is still today an important water-way and this region in the centre of the Carpathian Basin lies at the cross-roads of trade routes. Hungarian main line railways are operated by Hungarian State Railways. There are three main railway station in Budapest, the Budapest Eastern railway station, the Budapest Western railway station and Budapest Southern railway station, operating both domestic and international rail services. Budapest is one of the main stops of the on its Central and Eastern European route. There is also a suburban rail
Budapest Memorandum on Security Assurances or political independence of Ukraine, Belarus and Kazakhstan. As a result, between 1994 and 1996, Belarus, Kazakhstan and Ukraine gave up their nuclear weapons. Before that, Ukraine had the world's third largest nuclear weapons stockpile, of which Ukraine had physical if not operational control. The use of the weapons was dependent on Russian-controlled electronic Permissive Action Links and the Russian command and control system. Following the annexation of Crimea by the Russian Federation in 2014, the US, Canada, the UK, along with other countries, stated that Russian involvement was a breach of its obligations to Ukraine under the Budapest Memorandum,