By In-Soo Nam 
 

SEOUL--South Korea's Defence Ministry said Friday that it will buy 40 stealth F-35 fighter jets from Lockheed Martin Corp. (LMT) starting in 2018 after its rejection in September of planes built by rival Boeing Co. (BA).

The country's Joint Chiefs of Staff, however, said South Korea will buy an additional 20 next-generation fighter jets from 2023, adding that the purchase will not be restricted to F-35s, leaving the door open for Boeing and other aircraft makers to make fresh bids.

The budget for the purchases hasn't been set yet, it said.

South Korea's defence ministry said in September that Boeing's F-15 fighter jet fell short of its operating needs and reopened the bidding contest, in a move that highlights the challenge for global military chiefs of balancing affordability with securing expensive new technology.

Defence officials cited the need to address North Korea's nuclear threat with stealthy, radar-evading jets, though other regional tensions are also driving the preference for the latest technology.

South Korean air force officials have consistently indicated their preference for the F-35.

--Jeyup Kwaak contributed to this article.

Write to In-Soo Nam at in-soo.nam@wsj.com

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