Today's civil wars are also far more likely to affect other countries. Not only does fighting frequently spill across borders and draw in foreign forces, but neighbouring countries often face the burden of contending with refugees, disease outbreaks and increased military presence. Civil wars disrupt trade, discourage investment and depress economic growth across entire regions - and heighten the risk that other countries will fall into civil war as well. Even distant, developed countries are affected by other countries' conflicts since insecurity breeds a number of growing global problems, such as terrorism, HIV/AIDS and illegal arms and drug trafficking.