During World War I, as a result of the Russian defeat in the battle with the troops of the Central Powers (German Empire and Austro–Hungarian Monarchy) near Gorlice in 05.1915, fled from Volyn, where ministered, together with c. 3 million officials, teachers, military personnel, Orthodox clergy, etc., and their families, i.e. members of the administration of occupied partitioned Poland, into the depths of Russia (the so‐called bezhenstvo), and settled in the Rutkivsky Khutor village n. Zhytomyr in Ukraine. Returned after the fall of the tsarist regime in Russia and the separatist peace treaty concluded on 03.03.1918 in Brest‐Litovsk, by which Bolshevik Russia withdrew from the war, giving i.a. the Central Powers control over Ukraine. Shortly thereafter, on 11.11.1918, World War I ended, and Poland regained independence. Volyn became part of it. In 1939, ministered in the small village of Kosareve, administratively belonging to Dubno County in the Volyn Voivodeship, c. 12 km from the Mlyniv commune. At that time, Kosareve — a village and colony — was inhabited by c. 540 people, c. 97% Orthodox Ukrainians and a dozen or so Roman Catholic Poles.

After the German and Russian invasion of Poland in 09.1939 and the outbreak of World War II, in accordance with the provisions of the German–Russian, genocidal Molotov–Ribbentrop „friendship” pact, Volyn was occupied by the Russians. The Russians forcibly incorporated all Orthodox priests — previously belonging to the Polish Autocephalous Orthodox Church PAOC — into the Russian Church of the Moscow Patriarchate.

After the German attack on 22.06.1941 on their erstwhile ally, the Russians, and the beginning of the German occupation, the village became part of the Germ. Kreisgebiet Luboml (Eng. Lyuboml County) in the Germ. Generalbezirk Wolhynien–Podolien (Eng. General District Volyn‐Podolya) of an administrative entity called the Germ. Reichskommissariat Ukraine (Eng. Reich Commissariat of Ukraine).

A division occurred among the Orthodox clergy at that time. One of the factions of the Orthodox Church formed was the Autonomous Ukrainian Orthodox Church AUOC, the canonical proclamation of which was announced on 18.08.1941, by the synod of Ukrainian Orthodox bishops in Pochayiv Lavra. The AUOC strove for autocephaly, i.e. independence, but recognizing the supremacy of the Moscow Patriarchate. On 08‐10.02.1942, however, another group of Orthodox bishops announced the establishment of the Ukrainian Autocephalous Orthodox Church UAOC, under the auspices of the PAOC, which in turn, as early as 1940, had made an act of loyalty to the German genocide killer Hans Frank, Germ. Generalgouverneur (Eng. General Governor) of the German‐occupied and run quasi‐state called the Germ. Generalgouvernement (Eng. General Governorate), i.e. GG. In the territory of the Germ. Reichskommissariat Ukraine, the bishops of the UAOC considered themselves the successors of the PAOC, whose autocephaly had been granted by the Patriarchate of Constantinople. Based on the rather fragmentary information about his fate in the last years of his life, it seems highly probable that joined the UAOC.

There were no Jews in Kosareve, but their fate must have influenced the life of its village and parish. In 1941, in the above‐mentioned Mlyniv, there were prob. c. 1,500 Jews. At the turn of 1941/1942, the Germans began to implement the genocidal plan Germ. «Endlösung der Judenfrage» (Eng. Final Solution of the Jewish Question). On 22.05.1942, the Germans — and the Ukrainian police collaborating with them, the Germ. Ukrainische Hilfspolizei (Eng. Ukrainian Auxiliary Police), referred to as the Germ. Schutzmannschaft (Eng. Protection Battalions), i.e. Schuma — established a ghetto and surrounded it with barbed wire. The two gates were guarded by Schuma policemen. At the beginning of 09.1942, local peasants were forced to dig a large pit in the valley between Mlyniv and the village of Muravitsa, c. 1.5 km to the north, at the confluence of three small streams into the Ivka River, a tributary of the Styr. On 22.09.1942, Ukrainian police, under German control, surrounded the ghetto. C. 980 Jews were led out of the ghetto and murdered at the aforementioned pits. In 10.1942 — the exact date is unknown — the last, c. 520 Jews, were murdered there.

A few months later, in 02.1943 Roman Shukhevych, nom de guerre „Taras Chuprynka”, the chief commander of the Ukrainian, genocidal OUN/UPA organisation, who in 1941 was a member of the Ukrainian Germ. Sondergruppe Nachtigall (Eng. Special Group Nightingale) — a unit of the Germ. Wehrmacht (Eng. Armed Forces) that took part in the German attack on Russians in 1941, accused of participating in the Jewish pogrom in Lviv in 1941 — and later a member of the Germ. Schutzmannschaftsbataillon 201 (Eng. 201st Protection team Battalion) — responsible for the murder of Jews and civilians in the territory of Belarus — issued an order: „The extermination operation should be carried out according to the following principles: Polish villages are to be burned, and their populations massacred. Attacks on towns will take place in broad daylight, not at night. In mixed villages, the Polish population alone should be liquidated, and farmsteads should be burned only if they are 15 meters away and when there is no risk of the fire spreading to neighboring Ukrainian buildings. The Ukrainian population will receive instructions as to where to gather during the attack […] For every Ukrainian murdered, whether by Poles or Germans, 100 (one hundred) Poles will be executed”.

It was the de facto signal for the commencement of the «Genocidium Atrox» — i.e. the genocide perpetrated by Ukrainians, known as „Volyn genocide”.

Immediately thereafter, in 03.1943, the UPA issued an appeal to members of the Germ. Ukrainische Hilfspolizei and Schuma, to desert and join the UPA ranks. Perhaps as many as 10,000 Ukrainians did so.

The tactics of the genocidal Ukrainians were detailed in an order issued by the UPA commander in Volyn, Dmytro Klachkivsky, nom de guerre „Klym Savur”, in 06.1943. Anticipating Germany's defeat in the war with Russia, explained and ordered: „We should carry out a major operation to eliminate the Polish element. When the German troops withdraw, we should use this opportune moment to eliminate the entire male population aged 16 to 60 […] We cannot lose this fight, and we must weaken Polish forces at all costs. Forest villages and villages located near forest massifs should disappear from the face of the earth”.

The choice of Volyn for the beginning of the «Genocidium Atrox» and the genocide of Poles by the OUN/UPA was not accidental. Firstly, Volyn in pre‐war Poland had prob. the smallest percentage of Polish population in the entire country. Secondly, it was probably the least economically developed voivodeship of Poland, which was caused by the deliberate policy of the Russians in the 19th century, ruling then in part of partitioned Poland — the direct route to the heart of Russia, to Moscow, runs through Volyn, so no roads were laid there, no bridges built, no marshy areas around the Pripyat drained, no industry located, and no schools established. Thirdly, and finally, it was Volyn (and the Chełm region) that was recognized by the Central Powers in the Treaty of Brest‐Litovsk of 09.02.1918, as part of the short‐lived Ukrainian Peoples Republic UPR state — in 1943 the Germans simply fulfilled the obligations undertaken at that time. And Volyn was drenched in Polish blood. Tens of thousands of Poles were murdered by the Ukrainians — with German passivity — in an extremely barbaric manner. Hundreds of villages were burned.

Was prob. a sympathizer of the genocidal Ukrainian organization OUN/UPA. This is evidenced by the fact that one of his sons, Basil like his father — later the author of many poems — was the commander of the OUN/UPA „military intelligence” in the Mlyniv region, nom de guerre „Burlaka”. And in that region — where Kosareve was located — virtually no Polish villages remained; the Ukrainians murdered almost all the Poles in 1943. I.a., in Kosareve itself, at least four people were murdered, including one Polish family, and prob. also a family of Czech nationality.

Immediately afterwards, in 09.1943, arrested by the Germans, for unknown reasons.

Prob. transported to a prison in Dubno, c. 20 km to the south.

From there, taken to the Molodava village, c. 12 km northeast of Dubno, and murdered in a mass execution along with 30 other prisoners.

On 12.10.2007, the génocidaire Roman Shukhevych was posthumously awarded the title of Hero of Ukraine. In 12.2020, the Verkhovna Rada of Ukraine, in a resolution, recognized génocidaire Dmitry Klachkivsky as „the leader of the Ukrainian Insurgent Army in Volyn and a participant in the struggle for Ukraine's independence in the 20th century”. In several locations, monuments and commemorative plaques have been erected to these Lat. „hostis humani generis”, the schools were named after them.

Lat. „O Tempora! O mores!”