What is listed below relates to the constitutional duties of a citizen of the Russian Federation?

Resolution:

To answer this question, we need to identify which of the given options are defined as constitutional duties of a citizen in the Russian Federation. These are obligations that every citizen must fulfill according to the Constitution.

• determining their nationality - While nationality is a characteristic of a citizen, it is not a duty to be performed.
• paying legally established taxes - This is a direct constitutional duty of every citizen (Article 57 of the Constitution of the Russian Federation).
• participating in socio-political activities - The Constitution implies the right to participate, but not always a direct duty for every citizen in all forms. However, voting in elections is a duty.
• taking care of natural resources - This is a constitutional duty of every citizen (Article 58 of the Constitution of the Russian Federation).
• testifying in court - This is a civic duty that arises in specific situations and is regulated by law, but not a general constitutional duty for all citizens at all times.
• declaring one's income - This is a duty for specific categories of citizens and officials, as well as for general tax purposes, but not a universal constitutional duty for all citizens in the same way as paying taxes.

Based on the Constitution of the Russian Federation, the primary constitutional duties are paying taxes and protecting nature.

Answer: paying legally established taxes, taking care of natural resources.