It's been a kind of hectic spring and summer of 1940 in my UK GC.
Notable events prior to this: Czechoslovakia joined the Axis instead of giving up Sudetenland, Poland got partitioned, Allies declared war.
May 2nd: Axis declares war on Benelux.
May 5, 1940 : Soviet Union declared war upon us!
May 7, 1940 : Bulgaria declared war upon Belgium.
May 8, 1940 : Italy entered a Military Alliance with Germany, Czechoslovakia, Hungary and Romania.
May 9, 1940 : Germany annexed Luxemburg.
May 9, 1940 : Greece declared war upon New Zealand.
May 9, 1940 : Greece entered a Military Alliance with Germany, Czechoslovakia, Hungary, Romania and Italy.
May 10, 1940 : Yugoslavia declared war upon New Zealand.
May 10, 1940 : Yugoslavia entered a Military Alliance with Germany, Czechoslovakia, Hungary, Romania, Italy and Greece.
May 14, 1940 : Portugal entered a Military Alliance with Germany, Czechoslovakia, Hungary, Romania, Italy, Greece and Yugoslavia.
May 14, 1940 : Republican Spain joined our Military Alliance with (Allies).
May 15, 1940 : Yugoslavia left the Military Alliance she had with Germany, Czechoslovakia, Hungary, Romania, Italy, Greece and Portugal.
May 21, 1940 : Bulgaria entered a Military Alliance with Germany, Czechoslovakia, Hungary, Romania, Italy, Greece and Portugal.
May 26, 1940 : Yugoslavia declared war upon Soviet Union.
June 3, 1940 : Soviet Union declared war upon Estonia (and Latvia)
June 17, 1940 : Soviet Union declared war upon Lithuania.
It's now June 20th, and France is on the verge of collapse. Good thing for Germany that Yugoslavia waited until they'd left the Axis to declare war on the Sovietunion....
I was going to post and ask if this kind of wars were common in DD, but since I found this...