Gill - who was an MEP for almost six years and a member of the Welsh parliament, the Senedd, between 2016 and 2017 - is alleged to have been asked by former Ukrainian politician Oleg Voloshyn to make specific statements about Russia in return for money on at least eight occasions.
Nathan Gill, 51, has been charged with one count of conspiracy to commit bribery under the Criminal Law Act 1977, and with eight counts of bribery under the Bribery Act, 2010, the Metropolitan Police said.
Westminster Magistrates' Court heard Gill allegedly made statements in the European Parliament and in opinion pieces to news outlets, such as 112 Ukraine, which were "supportive of a particular narrative" and would "benefit Russia regarding events in Ukraine".
Gill was confirmed as leader of Reform UK Wales in 2021 ahead of Senedd elections, but reports suggest he left the party months later when he failed to win a seat.
Gill, from Llangefni on Anglesey, was previously a member of the UK Independence Party (UKIP), leading the Welsh wing of the party between 2014 and 2016.
