The opposition politician Alexei Navalny will continue seeking a reversal of the Central Election Commission decision not to register a group of voters who support his self-nomination as a presidential candidate, his representative Ivan Zhdanov told Interfax on Saturday.

"We will appeal today's Supreme Court ruling at the Presidium and will also appeal to the Russian Constitutional Court," Zhdanov said.

"In theory Navalny still has chances of taking part in the election, but in reality they are negligible," he said.

Both the Presidium and the Constitutional Court may quickly examine the complaints and compel the CEC to allow Navalny to run, Zhdanov said. "But we hardly believe in such an outcome," he said.

On December 30, 2017 a lower instance of the Supreme Court threw out Navalny's administrative lawsuit against the CEC decision not to register the voter group which nominated him as a presidential candidate.

This ruling was upheld by the Supreme Court on January 6 and thus has come into effect.

If the court does not overturn the ruling, it will also be appealed at the European Court of Human Rights, Navalny's representatives said earlier.