The Convention on the Rights of the Child (CRC) is an international treaty that sets out the civil, political, economic, social, and cultural rights of children. It was adopted by the United Nations General Assembly on 20 November 1989 and entered into force on 2 September 1990.

The primary responsibility of a guardian under international law is to protect the child's rights and interests. This includes ensuring that the child is safe, healthy, and has access to education and other essential services.

The principle of non-discrimination in the context of guardianship means that guardians must treat all children equally, regardless of their race, religion, gender, or disability. This principle is enshrined in the Convention on the Rights of the Child.

The principle of the best interests of the child in the context of guardianship means that guardians must always act in the best interests of the child. This principle is enshrined in the Convention on the Rights of the Child.

The state has a duty to ensure that all children have a guardian, to regulate the activities of guardians, and to provide financial support to guardians.

The Hague Convention on the Protection of Children and Co-operation in Respect of Intercountry Adoption is a treaty that sets out the rules for intercountry adoption. It was adopted on 29 May 1993 and entered into force on 1 January 1995.

The purpose of the Hague Convention on the Protection of Children and Co-operation in Respect of Intercountry Adoption is to ensure that intercountry adoption is carried out in a safe and ethical manner, to prevent the trafficking of children for adoption, and to promote cooperation between countries in the field of intercountry adoption.

Over 100 countries are parties to the Hague Convention on the Protection of Children and Co-operation in Respect of Intercountry Adoption.

The role of the central authority in the context of intercountry adoption is to facilitate the adoption process between countries, to ensure that the adoption is in the best interests of the child, and to prevent the trafficking of children for adoption.

The principle of subsidiarity in the context of guardianship means that guardians should always consult with the child's parents before making decisions. This principle is enshrined in the Convention on the Rights of the Child.

The principle of proportionality in the context of guardianship means that guardians should always use the least restrictive means to achieve their goals, should always consider the child's age and maturity when making decisions, and should always respect the child's right to privacy.

The principle of accountability in the context of guardianship means that guardians should always be accountable for their actions, should always be transparent in their decision-making, and should always be subject to review by a court or other independent body.

The role of the courts in the context of guardianship is to appoint guardians, to supervise guardians, and to resolve disputes between guardians and children.

The role of non-governmental organizations (NGOs) in the context of guardianship is to provide support to guardians, to advocate for the rights of children, and to monitor the implementation of guardianship laws.

Some of the challenges facing guardianship in the context of international law include the lack of a universal definition of guardianship, the lack of a uniform set of rules governing guardianship, and the difficulty of enforcing guardianship orders across borders.