Budapest narrowest point in Budapest. Pest lies on the flat terrain of the Great Plain while Buda is rather hilly. The wide Danube was always fordable at this point because of a small number of islands in the middle of the river. The city has marked topographical contrasts: Buda is built on the higher river terraces and hills of the western side, while the considerably larger Pest spreads out on a flat and featureless sand plain on the river's opposite bank. Pest's terrain rises with a slight eastward gradient, so the easternmost parts of the city lie at the same altitude
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,