It is reported that thousands of tanks are currently being used in the Ukraine War. To help Ukraine, Britain is sending 14 Challenger 2 tanks and America is sending a few (50) Bradley infantry fighting vehicles, which seems like a small number compared to the total number of armored vehicles in the current war. Meanwhile, according to some estimates,
Russia may have around 17,300 tanks produced between the late 1950s and now.
Why is this considered to be a significant event, given that the number of armored vehicles being sent is in the double digits?