https://visegradinsight.eu/between-the-eastern-flank-and-mitteleuropa/
https://www.sigar.mil/pdf/lessonslearned/SIGAR-21-46-LL.pdf
https://media.defense.gov/2022/Nov/29/2003122279/-1/-1/1/2022-MILITARY-AND-SECURITY-DEVELOPMENTS-INVOLVING-THE-PEOPLES-REPUBLIC-OF-CHINA.PDF
https://dserver.bundestag.de/btd/20/057/2005700.pdf