On Thursday, Polish border guards detained a 15-year-old schoolboy from Czechia who was on his way to fight against Russia on the side of Ukrainian troops.

Seznam Zprávy notes, referring  to the Border Guard in Polish Silesia, that the boy had just crossed the Polish-Ukrainian border, but "thanks to the quick actions of the Silesian Border Police and impeccable international cooperation, the Czech was taken to Poland without delay", from where he will return home to the Czech Republic's Ostrava.

The 15-year-old reportedly left home on Wednesday but did not come to school, after which his parents informed the police and provided a description of their son.

The Czech police passed on his details to their Polish counterparts who serve at the station in the Czech town of Chotěbuz. The Polish police traced the boy's phone and found out that he was in Przemyśl, Poland, near the border with Ukraine.

It was found that the teenager had prepared his passport back in Czechia to go to Ukraine to fight against Russian aggressors.

Earlier, the Supreme Court of Appeal in Prague upheld a 21-year sentence in absentia for Czech citizen Alojz Polak, who fought in Ukraine’s east on the side of the militants of the non-recognised and self-proclaimed "Donetsk People’s Republic".

His lawyer noted at the main trial that his client was probably no longer alive.

It was reported earlier that in the Czech Republic, Nela Liskova, a supporter of Russia and former "honorary consul" of the "DPR", will be tried for incitement to hatred against Ukrainians and Ukraine.