Answer:
Foreign relations help a country to achieve maximum benefits from the relationship between it and other countries. The relationship may be in the area of economy, defense etc
Checks and balances helps the country to prevent the selfish interests of people and eliminate any form of compromise which could pose a negative threat to the country as a whole.
The disadvantage of check and balance is that the foreign relations and response of the government could be slow due to the thorough processes being undergone in order to reach the best decision suitable for the country.