US President Donald Trump and South Korea's acting President Hwang Kyo-ahn discussed security measures to tackle potential threat posed by North Korea, the White House said in a statement, Sputnik reported.
On Sunday, Trump and Hwang held a phone conversation and discussed a number of issues, including the existing alliance between the two countries.
"The two leaders agreed to take steps to strengthen joint defense capabilities to defend against the North Korean threat," the statement said on Sunday.
The statement added that the leaders had also discussed a number of issues, including the forthcoming visit of Secretary of Defense James Mattis to the Asian country, reflecting the "close friendship" between Washington and Seoul.