After the February Revolution in 1917, he was assigned to the vice presidency of the Red Cross under Alexander Kerensky's newly formed Russian Provisional Government to oversee the treatment of German prisoners during World War I.Perhaps due to his experience with economics and his invaluable connections in the West, Navachine managed to stay in good favour with the Communist Party when it seized power late in 1917, despite being a Kerensky supporter.[2] On the morning of 25 January 1937,[3] while walking his fox terrier dog in Bois de Boulogne, Navachine was assassinated, stabbed to death in an incident still unsolved by French police; he was 47 years of age.[2] His assassination has been connected to at least three other murders carried out during a state of ongoing violence in France: Italian anti-fascist dissidents Carlo and Nello Rosselli, and undercover agent Laetitia Nourrissat Toureaux.[2][4][5] Panteleimon Takhchiyanov, an officer of the NKVD, is suspected to have carried out Navachine's assassination, possibly to silence him before he released evidence proving the innocence of Soviet political prisoners.