This week's article revisits a disinformation campaign that spread widely across Polish and Czech social media this summer, claiming a border dispute was brewing between the two nations. The article from the Czech newspaper Denik N is especially relevant for first-year students studying borders and the information wars waged by countries like Russia to undermine Western public opinion. By late August, Czech and Polish social media platforms were flooded with rumors suggesting that Warsaw wanted to forcibly reclaim the Cesky Tesin region from the Czech Republic. These rumors were spread through fake accounts, including a fabricated profile of the Czech Republic's ambassador to Poland, and supported by forged official documents and a website that imitated the Czech public radio station iRozhlas.cz. The disinformation campaign was so effective that both governments had to publicly deny the claims, and Czech intelligence services were mobilized to investigate. The evidence points to Russia as the source of the campaign. This follows an investigation by Bulgarian journalist Christo Grozev, conducted with the German magazine Der Spiegel and the independent Russian media outlet The Insider, published in 2024. Based on pirated documents from Russian intelligence, the report reveals that in May 2022, following Russia's initial setbacks in Ukraine, two officers from the SVR, Russia's foreign intelligence service, devised a plan to gain influence in the information sphere. Their goal was to create distrust among Europeans toward their own governments by overwhelming them with contradictory information, leading to a state of cognitive dissonance — a psychological discomfort caused by conflicting information that sows doubt. The choice of the Cesky Tesin region was not random. Historically, the area has been a point of contention between the Czech Republic and Poland, with conflicts over the region dating back to 1919. Poland later occupied Cesky Tesin in 1938 following the Munich Agreements, in which France and the United Kingdom allowed Adolf Hitler to dismantle Czechoslovakia. More broadly, Russian intelligence services are suspected of several destabilizing actions, such as placing coffins at the base of the Eiffel Tower in June 2024 or orchestrating the influx of tens of thousands of migrants to Ceuta, a Spanish enclave in North Africa, at the end of July last year. The Cesky Tesin affair is a clear example of hybrid warfare — a strategy that uses non-military tactics like cyberattacks, propaganda, sabotage, and interference in another state's political processes to weaken an adversary without resorting to open conflict. This form of warfare exists in the gray area between peace and war, where the lines between legitimate information and manipulation become increasingly blurred.