Vasiura's wartime activities were not fully revealed until the mid-1980s, when he was convicted as a war criminal by a Soviet military court and executed in 1987 for his role in the Khatyn massacre.

By the beginning of the Nazi invasion of the USSR in June 1941, Vasiura commanded a communication squad of the 67th Rifle Division (according to data of his war prisoner card, he served in the artillery forces).

While in captivity he agreed to collaborate with the Germans, and in February 1942 he was sent to the school of propagandists (first in Wustrau, later in Wutzetz) organized within the camp Stalag III-D under the authority of the Reich Ministry for the Occupied Eastern Territories.

After graduating from the school of propagandists in October 1942, Vasiura was sent to Kiev, where he joined the 118th Schutzmannschaft battalion composed of former Soviet soldiers and Ukrainian collaborators.

The unit had a double leadership: German Major Erich Körner was in charge, while Vasiura supervised the battalion on a daily basis.

From January 1943 to July 1944, Vasiura and his battalion conducted dozens of pacification actions – including operations Hornung, Draufgänger, Cottbus, Hermann and Wandsbeck[5] – that were part of the "dead zone" policy of annihilating hundreds of Belarusian villages in order to remove the support base for the alleged partisans.

Partisans killed Hans Woellke, the hauptmann (captain) of the auxiliary police and commander of the first battalion's company, who was on his way to the Minsk airport.

In 1952, the Kiev Military Tribunal sentenced him to 25 years imprisonment, but on 17 September 1955 he was amnestied in accordance with a decree issued by the Presidium of the Supreme Soviet.

Vasiura moved to the village Velyka Dymerka (Brovary District, Kyiv Region) and became the economic director of the Velikodymersky state farm.

He built a big house, was encouraged several times for conscientious work, and received a membership of the Communist Party of the Soviet Union (CPSU).

He would give patriotic speeches in front of cadets and pioneers, making reference to his fictional battle feats, pretending that he was a Red Army veteran.

Further searches in the archives forced them to review some results of the interrogation of Vasyl Meleshko, Vasiura's former fellow soldier, who was executed in 1975 for collaboration with the Nazis and participation in the burning of Khatyn.

On 26 December 1986 the Tribunal of the Belorussian Military District, headed by Judge Viktor Glazkov, sentenced Vasiura to death by shooting.