Is CheapESIM's Lithuania plan valid in non-EU neighboring countries such as Belarus or Kaliningrad (Russia)?

No, a CheapESIM plan designed for Lithuania, which is an EU country, will not provide coverage in non-EU neighbors like Belarus or Kaliningrad (Russia). If your journey takes you from Vilnius to Minsk, your connection will cease at the border. Attempting to use your Lithuanian eSIM in these regions would incur extremely high, unexpected roaming charges from any network. For travel to these specific non-EU areas, you'll need a separate, dedicated eSIM plan to ensure continuous, budget-friendly connectivity and avoid bill shock.