lol minor civs/city states are always more important diplomatically, just like in real life. Countries that are not America, France, England, Germany, China,... etc... ARE basically "city states". Like when Nazi Germany invaded city state Poland and they get minor diplo hits with France and England. Then Germany invaded and puppeted France, taking their capital so then Allies power denounced Germany and went to war. Russia and Allies fight in WW2 together. but immediately afterward Soviets were crazy and become a superpower so America see that as a threat and denounced them and they fight wars on city states ground.
Wow..... this is crazy

I hope you are just joking
For all other people thinking it is true:
Poland a city state? You are mad man....

In 1939, the Poland's area was 388 634 km², while the Great Britain is atm 244 820 km², German is 357 114,22 km²..... that was really big country, definitely one of the major european powers.
People claiming like that (and not joking) don't really know history.
Do you know what really happenned?
About Poland - you can see here main directions of attack (both german and russian):
http://www.szkolarbis.pl/photos/1942.jpg
There was no chance to defend because France and England did nothing to help them (in spite they were obligated to do it, it didn't happen and that's why pact Ribbentrop-Molotow might be entered). Well, in fact, France payed for this several months later (laughably they capitulated in the same time as surrounded Poland). France and England thought that Hitler would have been contented by conquering Poland. Simply they were afraid and didn't care. I belive that their fast couter-attack would have succeed (almost all troops fought against Poland).
So, there were no minor diplomatic penalties. There was just a broken military alliance (talking about *immediately* military help - not fulfilled of course) and peace-keeping policy.
"Allied powers denounced Germany" ha ha lol that was funny, really funny.
But, going on...
Hopelessely inaccurate. France and Englad declared the war in 1939, so....There was no denounciation of course. Everyone recognized Hitler as warmonger and the England was fighting that time "alone" (but in fact supported by allies, Czech, Poland, Canadian, French etc. fighter pilots -- without that they had had surrended too).
Russia went in war not before than in 1941, attacked by Hitler (Barbarossa sounds familiar?).
Russia was really weak on the beginning and only supplies from the allies (USA, England) was decisive. With these supplies Russia had time to reforce and first build war industry beyond front, then next build really enormous and modern army. Then become the superpower.