Belarus has warned Ukraine it will respond with what it called “full available capabilities” if its border is crossed, escalating rhetoric as tensions rise along NATO’s eastern flank. Deputy Foreign Minister Igor Sekreta said Minsk would react forcefully to any unauthorized or hostile incursion, describing Belarus’ frontier as a “red line” already defined by President Alexander Lukashenko.JOIN US ON TELEGRAMFollow our coverage of the war on the @Kyivpost_official. “If the border is crossed without permission or in an aggressive manner, we will respond using our full potential and all our capabilities,” Sekreta said in comments carried by Russian state media on Monday. He also claimed Western countries understand that any strike on the Russia–Belarus “Union State” would trigger an immediate response. Ukraine: Border militarization accelerating The warning comes as Kyiv says Belarus is rapidly reinforcing its side of the border. Ukrainian President Volodymyr Zelensky said that construction of road networks, ammunition depots, and fuel and lubricant storage facilities is nearing completion along the Ukrainian-Belarusian frontier following a briefing from Foreign Intelligence chief Oleh Lugovskyi. In a Telegram post on Thursday, June 25, Zelensky said activity has been recorded across five key corridors: Kobryn–Kovel, Ivanove–Manevychi, Luninets–Sarny, Rechitsa–Korosten, and Gomel–Chernihiv. He added that Russian internal planning documents reportedly describe the infrastructure expansion as linked to Moscow’s so-called “special military operation.”On June 15, Lukashenko had rejected the idea of Belarus entering the war, stating that any spillover of the conflict onto Belarusian territory was “absolutely unacceptable.”