There are mainly two types of areas in the field of education in which treaties or agreements are forged: Portugal has been a member of the United Nations since 14 December 1955, and its participation in the education sector in UN international projects has been marked by the preparation of responses to requests of various forms, such as.B. Reports on the implementation of treaties , pacts and conventions that have been signed by the Member States. to which this ministry has made a substantial contribution, with regard to human rights. At the end of 2017, the OEI regional office was opened in Lisbon, confirming Portugal`s commitment to participate more actively in the OEI`s programmes and activities, consolidating existing cooperation and underlining Portugal`s position as an important partner and as a contact platform with other regional regions or spaces such as the CPLP and the EU. Then there are the good faith requirements that a negotiator must meet: oral agreements are based on the good faith of all parties and can be difficult to prove. On May 24, 2002, Presidents George W. Bush and Vladimir Putin signed the Strategic Offensive Reduction Treaty (SORT), under which the United States and Russia reduced their strategic arsenals to 1,700-2,200 heads. The warhead border came into force and expired on the same day, December 31, 2012. Although the two sides have not agreed on specific counting rules, The Bush administration stated that the United States would reduce only warheads used on strategic active-duty delivery vehicles (i.e. “operational” warheads) and would not count warheads removed from service and placed in warehouses or warheads on delivery vehicles that are obsolete or repaired. The limits of the agreement are similar to those provided for START III, but the contract did not require the destruction of delivery vehicles, as START I and II did, nor the destruction of warheads, as planned for START III. The treaty was approved by the Senate and Duma and came into force on 1 June 2003.