Modern-Aviation

10. Korea, Republic
- Military expenditure (2017): $39.2 billion
- Military expenditure as a % of general government expenditure (2017): 12.1% (#16 among countries)
- Military expenditure per capita (2017): $761 (#13 among countries)
Tensions between South Korea and its northern neighbor shaped much of the Republic's defense policy—and budget since the Korean Peninsula was divided at the end of the Korean War. A significant portion of the budget proposed in 2018 has been earmarked for efforts to increase cooperation between the two countries. President Moon Jae-in and North Korea's Kim Jong Un signed the Panmunjom Declaration after a summit in April last year and committed to halt in hostilities and denuclearization, though that goal remains elusive.

25. Oman

- Military expenditure (2017): $8.7 billion
- Military expenditure as a % of general government expenditure (2017): 26.3% (#3 among countries)
- Military expenditure per capita (2017): $1,874 (#6 among countries)
Oman's resources and location make it a high-security risk because ships carrying 20% of the world's oil pass through the Strait of Hormuz, which lies between Oman and Iran. Iran has threatened to cut off access to the strait in the event of conflict. Oman also hosts the U.S. during operations in the Middle East and assists in counter-terrorism operations. Thanks to its commitment to neutrality, Oman often mediates conflicts between the U.S. and Iran and other conflicting groups in the Middle East.