do not need visas for entry into any of the member states. Some countries in the Commonwealth do not require tourist visas of citizens of other Commonwealth countries. Citizens of member states of the Association of Southeast Asian Nations do not require tourist visas to visit another member state, with the exception of Malaysia and Myanmar; both countries require citizens of the other country to have an eVisa to visit. Until 2009, Burmese citizens were required to have visas to enter all other ASEAN countries. Following the implementation of visa exemption agreements with the other ASEAN countries, in 2016 Burmese citizens are only required to have visas to enter Malaysia. Commonwealth of Independent States (CIS) member states mutually allow their citizens to enter visa-free, at least for short stays. There are exceptions between Tajikistan and Uzbekistan, and between Armenia and Azerbaijan. Nepal and India allow their citizens to enter, live, and work in each other's countries due to the Indo-Nepal friendship treaty of 1951. Indians do not require a visa or passport to travel to Bhutan and are only required to obtain passes at the border checkpoints, whilst Bhutan nationals holding a valid Bhutanese passport are authorized to enter India without a visa. Citizens of Mercosur full member and associate countries can enter without a visa in any of the member and associate countries, just needing to present the ID card. Other countries may unilaterally grant visa-free entry to nationals of certain countries to facilitate tourism, promote business, or even to cut expenses on maintaining consular posts abroad. Some of the considerations for a country to grant visa-free entry to another country include (but are not limited to): being a low security risk for the country potentially granting visa-free entry diplomatic relationship between two countries conditions in the visitor's home country as compared to the host country having a low risk of overstaying or violating visa terms in the country potentially granting visa-free entry To have a smaller worldwide diplomatic staff, some countries rely on other country's (or countries') judgments when issuing visas. For example, Mexico allows citizens of all countries to enter without Mexican visas if they possess a valid American visa that has already been used. Costa Rica accepts valid visas of Schengen/EU countries, Canada, Japan, South Korea, and the United States (if valid for at least 3 months on date of arrival). The ultimate example of such