Based on my research, I can evaluate this claim:
Reasoning:
- Ukraine declared independence on August 24, 1991
- On November 4, 1991, Ukraine enacted the "Statute of Ukraine concerning the State frontier", which established comprehensive border regulations
- This statute explicitly defined the State frontier of Ukraine, established rules for crossing the border at designated points of admission, and mandated frontier and customs inspections for persons, vehicles, and cargo crossing the border
- The statute also required the establishment of admission checkpoints, customs offices, and other offices for monitoring the State frontier
- Additionally, Ukraine enacted a Law on Citizenship on October 8, 1991, which came into force on November 13, 1991, establishing rules for who could enter and reside in Ukraine
- These laws were enacted shortly after independence as part of Ukraine's assertion of sovereignty and territorial integrity
The claim that "Ukraine did not introduce border rules in 1991" is factually incorrect. Ukraine introduced multiple border-related laws and regulations in 1991, including the Statute concerning the State frontier on November 4, 1991, which specifically governed how persons, transport, and goods could cross Ukraine's borders.
Overall validity: 5%