The United Nations condemns Russia for holding presidential elections in parts of Ukraine occupied by Moscow's invading forces.
If President Vladimir Putin completes another Kremlin term, he would stay in power longer than any Russian leader since Catherine the Great in the 18th century.
He is running unchallenged, having barred two candidates who opposed the conflict in Ukraine and around one month after his main opponent, Alexei Navalny, died in an Arctic prison in unexplained circumstances.