Issue 91 of the Revista Mexicana de Política Exterior presents a variety of topics that occupy a special place on the current diplomatic agenda, such as the necessary transformation of the governance of the international financial system; the enlargement of the European Union during the past decade and its political-institutional implications; the reformulation of the foreign policy of global powers, such as the Russian Federation in the matter of nuclear weapons; the centenary relationship between Russia and Mexico (which celebrated their 120th anniversary in 2010), and multilateral efforts to regulate climate change.