A Russian anti-corruption campaigner and long-time ally of Kremlin foe Alexei Navalny has shared what she claims are photos of Vladimir Putin's youngest son as part of a long-standing investigation.

Maria Pevchikh revealed astonishing details of how the 'princes' are educated at home in Putin's hidden palaces by tutors on super salaries of $36,000 a month as she shared photos of the two children rumoured to be Putin's secret sons.

Multiple pictures have emerged recently of Swiss-born Ivan, but this is the first time 72-year-old Putin's second son and youngest child is believed to have been pictured.

Six-year-old Vladimir Junior was born in Moscow in 2019 and like his brother Ivan, 10, there is no official information about him, or the despot's relationship with their alleged mother Alina Kabaeva, 42, an Olympic gold medal winning gymnast.

Leaked data shows their teachers are secretly paid by a company linked to Putin-friendly oligarch Gennady Timchenko, 72, who also supports Kabaeva and boasts a £16 billion fortune, according to Ms Pevchikh.