What is the ruling on taking a retirement pension due to inability to work from a European country where a Muslim resides?

It is permissible to retire from work and benefit from the retirement grant if the country's law allows it. However, if the means to achieve this involves trickery, deception, and forgery, then it is not permissible. One must abide by the laws of the state that prohibit theft, cheating, and wrongfully consuming people's wealth.