Based on the table, identify the republic with the highest percentage of its indigenous nationality and the republic with the highest percentage of Russians.

Analysis of Republics' Nationalities:

• The republic with the highest percentage of its indigenous nationality is Chechnya, with 87.7%.
• The republic with the highest percentage of Russians is Tuva, with 32%.

Explanation: By comparing the 'Indigenous Nationality, %' column, Chechnya shows the highest value. For the 'Percentage of Russians' column, Tuva has the highest percentage among the listed republics.