>There is no inherent reason why Germany cannot singlehandedly support/fund Ukraine's war with a country with an economy 40% Germany's size.
There certainly is an inherent reason, which is that Germany and the German economy is dependent on Russian oil and gas as well as fertilizer and a whole host of other natural resources. This inherent reason will initially be felt only economically as factories and industries shut down without the resources need to continue production. In a few months when the temperature starts dropping this inherent reason will be felt in a much more interpersonal way as the German people start freezing to death when they can not afford to heat their homes or find the fuel to do so.
There certainly is an inherent reason, which is that Germany and the German economy is dependent on Russian oil and gas as well as fertilizer and a whole host of other natural resources. This inherent reason will initially be felt only economically as factories and industries shut down without the resources need to continue production. In a few months when the temperature starts dropping this inherent reason will be felt in a much more interpersonal way as the German people start freezing to death when they can not afford to heat their homes or find the fuel to do so.