Assisting a non-muslims

This depends on the level of suffering of the "Muslim friend" in comparison to that of the non-Muslim. If the non-Muslim does not have basic survival items if living, whilst the "Muslim friend" has this but is "suffering" then aid the non-Muslim. So one requires to reasonably, sensibly, carefully assess the situation before making a decision. Use the assistance of your local Ulema and Ma- Shaikh to do so.