Republic of the Congo → Russia
Republic of the Congo plugs
Russia plugs
Shared plug type: C
Compatibility: Compatible
Voltage — Republic of the Congo 230V — Russia 230V
Voltage is the same. Your devices should work normally.
Device compatibility (phones)
Phones almost always support 100–240V, so yours should work safely. Check your charger label to confirm.
You likely only need a plug adapter (if socket shapes differ). Voltage is close between these countries.