A single color gradient would be more appropriate here to easily compare the countries to each other. If the invasion aspect was explicit in the representation of the visualization only then would red - green make sense as you have them established that the visualization is addressing a topic that has a good-bad dimension.
Easy_Watercress_2663 t1_jbpljwk wrote
Reply to comment by JackdiQuadri97 in [OC] Distance of each European country's capital city from an international border by SuchBrightness
A single color gradient would be more appropriate here to easily compare the countries to each other. If the invasion aspect was explicit in the representation of the visualization only then would red - green make sense as you have them established that the visualization is addressing a topic that has a good-bad dimension.