Estonian kroon 4 days after the founding of the Estonian SSR, the last Estonian pre-WW II coin, the new 1 sent (date 1939), was issued. In 1927, before the kroon was officially introduced, 100 marka banknotes circulated with an "ÜKS KROON" (1 kroon) overprint. Eesti Pank introduced 10 krooni notes in 1928, followed by 5 and 50 krooni in 1929, 20 krooni in 1932 and 100 krooni in 1935. The kroon was reintroduced as Estonia's currency on 20 June 1992, replacing the Soviet ruble at a rate of 1 kroon = 10 rubles. (Each person was able to change a maximum of
Economic and Monetary Union of the European Union eurozone member states and to impose flexible labour markets and flexible wages, might constitute a serious threat to Social Europe. In December 2012, at the height of the European sovereign debt crisis, which revealed a number of weaknesses in the architecture of the EMU, a report entitled ""Towards a genuine Economic and Monetary Union"" was issued by the four presidents of the Council, European Commission, ECB and Eurogroup. The report outlined the following roadmap for implementing actions being required to ensure the stability and integrity of the EMU: In June 2015, a follow-up report entitled ""Completing Europe's Economic and Monetary