In the late nineteenth century and early twentieth century, Serbian politics were driven by ethnic/racial calculations. Many Serbs believed they had an ethnic bond with Russians and this created economic and diplomatic tension with Austria-Hungary.
True or False?

True.

Explanation:

Slavs and Russians are Slavic nations and Serbia consolidates diplomatic and economic bonds with the Russian Empire in late nineteenth century due to the Panslavic policies promoted by Russian Tsars, even to point that existed a committment of the Russian Empire to protect Serbia in the case of an Austrian-Hungarian invasion, which happened in 1914.