Does the entry and exit of Russian electronic visa have to be at the same port?

This situation is not necessarily the same port.

As long as it is in the designated area of electronic signs, all ports open to electronic signs can enter and exit, but not through Katsuragi and Dongning.

However, it should be noted that it may be necessary to register with the Russian Immigration Bureau during the stay, depending on the time the individual plans to stay in Russia. If you plan to stay in Russia for more than 7 working days, you need to register with the local immigration office within 3 working days after your arrival.