Secret handshake mystery

A unique handshake: one participant extends the forefinger while wrapping his remaining fingers around his opponent’s hand. The other participant takes a dominant stance, pressing the thumb to the top of his opponent’s hand. As only three fingers are visible at the bottom of the dominant party’s hand, it may be surmised that his forefinger is also extended.

This handshake is not found among samples of the common Masonic ones. Any ideas on the meaning of this unusual handshake can be submitted via my Contact page.

Pope Francis and Vladimir Putin, December 2022

Pope Francis and Cristina Kirchner, President of Argentina, 2013

Donald Trump and Putin, date unknown.