however, the number of visitors dropped significantly. Following the collapse of the Austro-Hungarian Empire, the Polish–Ukrainian War and the Polish–Soviet War, Truskawiec became part of Poland again. Administratively it was the seat of Gmina Truskawiec, located in the Drohobycz County of the Lwów Voivodeship. As the spa was not destroyed in these conflicts, activity resumed quickly, as early as 1920 and Truskawiec soon emerged as a popular spa destination. In the 1920s and 1930s, almost 300 hotels, villas and guest houses were built here. The town was awarded three gold medals as the country's best spa resort. Next to Krynica-Zdrój, it was the most visited and most popular resort in Poland. A number of notable Polish personalities visited Truskawiec during that era, including politicians (Stanisław Wojciechowski, Józef Piłsudski, Wincenty Witos, Ignacy Daszyński), artists (Eugeniusz Bodo, Adolf Dymsza, Julian Tuwim, Stanisław Ignacy Witkiewicz, Bruno Schulz, Zofia Nałkowska, Marian Hemar, Hanka Ordonówna, Jan Kiepura, Zofia Batycka, Antoni Słonimski), athletes (Stanisława Walasiewicz, Halina Konopacka, Janusz Kusociński) and Generals Stanisław Maczek and Kazimierz Sosnkowski. Numerous guests from abroad came there as well. In 1935, the Prime Minister and future president of Estonia Konstantin Päts visited the spa. Rajmund Jarosz, who was the owner of the spa since 1911, founded the Museum of Natural History (Muzeum Przyrodnicze'') and a salt-sulfur pool, later destroyed during World War II. On August 29, 1931, Vasyl Bilas and Dmytro Danylyshyn, two members of the Organization of Ukrainian Nationalists, assassinated Tadeusz Hołówko, a Polish cabinet minister and known advocate of Polish-Ukrainian rapprochement vacationing in Truskawiec. This caused an increase in Polish-Ukrainian tension, which culminated in the Ukrainian genocide of Poles in 1943. After the Soviet invasion of Poland in 1939, the spa was transformed into a sanatorium for Red Army soldiers. From 1941 to 1944 it was under German occupation, and after 1944 under Soviet occupation again. Under the Potsdam Agreement of 1945, it was taken from Poland and annexed by the Soviet Union. Under Soviet rule, most of the historic buildings were destroyed and replaced with typical Soviet architecture. In 2008, the Adam Mickiewicz monument, which survived World War II and Soviet rule, was renovated. Until 18 July 2020, Truskavets was incorporated as a city of oblast significance. In July 2020, as part of the administrative reform of Ukraine, which reduced the number of raions of Lviv Oblast to seven, the city of Truskavets was merged into Drohobych Raion.