9.8. Derivative loss of nationality The derivative loss of nationality is prohibited. 10. Deprivation by proxy and proxy measures 10.1. States must not use powers to deprive nationality for other stated purposes, including fraud, with the ulterior purpose of depriving nationality as a national security measure. 10.2. States must not subject persons to proxy measures, which do not amount to deprivation of nationality, but which have a similar impact and implications on human rights, without subjecting such decisions to the same tests and standards set out in these Principles. Such measures may include the withdrawal or refusal to renew passports or other travel documents and the imposition of travel or entry bans. 10.3. The measures referred to in section 10.2 may in some circumstances, be considered to constitute deprivation of nationality, particularly when imposed on persons when they are abroad. 11. International cooperation 11.1. States have a duty to cooperate and to act responsibly and in accordance with international law to maintain international peace and security and to promote and encourage respect for human rights and fundamental freedoms. 11.2. States must not undermine the principle of reciprocity or commitments to international cooperation, by stripping a person of nationality, expelling a person to a third country or subjecting a person to removal proceedings, thereby exporting the stated security risk to a third country and failing to take responsibility for their own nationals. 11.3. States are obligated to take responsibility for their own citizens and to investigate and prosecute crimes and threats to national security through their national criminal justice frameworks in accordance with international standards. 18