After leaving Crimea with the remnants of Baron Wrangel's forces, Slashchov eventually reconciled with the Soviets and returned from Constantinople to Moscow in 1921.

Slashchov, known among his subordinates as "General Yasha",[1] joined the Volunteer Army in December 1917 and was appointed Andrei Shkuro's chief of staff in May 1918.

He succeeded in defending the Perekop Isthmus from the Red Army in late December 1919 and prevented the Bolsheviks from penetrating into the Crimean peninsula [ru] (January to March 1920).

Slashov's example proved instrumental in bringing many other retired White Army officers back to Soviet Russia.

He published a memoir entitled The Crimea in 1920 (1924) and delivered lectures at the Vystrel Higher Officers' Courses before he was killed by a man avenging a relative's death.