Explanation:
i. Loss of citizens through peace keeping operations.
ii. Influx of refugees and its impact on the economy.
iii. Increase in crime rates by some foreign nationals.
iv. Smuggling across Nigerian borders.
v. Ideological differences among nations
vi. Clear definition of national interest.
vii. Regional insecurity.
viii. Problems of insecurity among nations.
ix. Unclear border demarcations.
x. Brain drain syndrome.