A Russian legal NGO said the woman, named by Russian media as Ksenia Khavana, may stand accused of transferring $51 (£40) to a Ukrainian charity in February 2022, on the day Vladimir Putin launched his invasion of the country. She faces up to 20 years in prison.

Russia’s FSB reported on Tuesday that it had detained a 33-year-old woman from Los Angeles who holds dual citizenship. Reports said she had attended the Ural Federal University in Ekaterinburg and later married an American citizen and moved to the US.