This question depends on your goals. Note that the largest turnover is traditionally given by the USDRUB pair. Below we will show graphs of changes in different pairs on MICEX, available in the Transaq trading terminal.
123. The dollar-ruble pair for the period from 2014-2022.
Figure 124. The euro-ruble pair for the period from 2014-2022.
Figure 125. The British pound-ruble pair for the period from 2014-2022.
Figure 126. The Chinese yuan-ruble pair for the period from 2014-2022.
Fig.127. Swiss franc-ruble pair for the period from 2017-2022.