Both the latter and Serbia to the north are out of the Schengen Area, which is why the refugees prefer this way to reach countries such as Germany and Sweden, so entering again the Schengen Area from Serbia; in case of arrest, they will be sent back to Croatia or Hungary (closer to their desired immigration destinations, especially Germany), and not to Greece, which is farther south.
后者和北方的塞尔维亚都不在申根区，这就是为什么难民更喜欢这种方式到达德国和瑞典等国家，所以再从塞尔维亚进入申根区，如果被捕，他们将被遣返回克罗地亚或匈牙利（接近他们想要的移民目的地，特别是德国），而不是南方的希腊。