Global defense expenditures rose last year for the first time since 2011, according to a new report published by the Stockholm International Peace Research Institute.
In total, defense expenditures were $1,676 billion ($1.7 trillion) in 2015, an increase of 1.0%. The top five countries that spent the most were the U.S. ($596 billion), China ($215), Saudi Arabia ($87.2), Russia ($66.4), and the UK ($55.5).
The 15 top-spending countries remained the same from 2014 to 2015, although there was some shifting within that order.
WATCH MORE: Why Do Russians Love Vladimir Putin?
Russia's annexation of Crimea and potential advancement into North Atlantic Treaty Organization territory drove Eastern European countries like Lithuania, Poland and Latvia to increase their respective defense budgets.
A similar trend was recorded among Southeast Asia nations, following China's aggressive claims over territory in the South China Sea.
The falling price of oil also had an impact on military spending, according to Bloomberg. Whereas Russia was ranked third by SIPRI in 2014, low oil prices pushed the country's military spending to fourth place in 2015.
Saudi Arabia's economy has also taken a hit from low oil revenue, but, due to a major military conflict in Yemen, its defense spending rose.
Overall, SIPRI's report indicated that military spending accounted for 2.3% of the world's gross domestic product.
Top photo: A U.S. Air Force Boeing C-17A Globemaster III large transport aircraft flies over a minaret after taking off from Incirlik air base in Adana, Turkey, in this August 12, 2015 file photo.