ebay: Avia B534

[Snautzer01]

Did they pay the Germans?

 

[Wurger]

Nope. They worked together. Slovakia is the country that attacked Poland along with Germans in 1939 and later invaded with them Russia. At that time it was called the Slovak Republic and was a partially-recognized client state of Nazi Germany which existed between 14 March 1939 and 4 April 1945. The national marking on their planes was the similar to the German's cross but of blue colour with the dull red disk. The Slovak AF were called Slovenské Vzdusné Zbrane (SVZ) - Slovak Air Arm.

the pic source: the net.