By Timothy Gardner, David Brunnstrom and Ju-min Park WASHINGTON/SEOUL (Reuters) - The U.S. Department of Energy has designated ally South Korea a "sensitive" country, a spokesperson said on Friday, after the South Korean president briefly imposed martial law and amid talk of Seoul potentially developing nuclear weapons.

South Korea's foreign minister told the country's legislature Wednesday that developing nuclear weapons is not off the table

The U.S. Department of Energy (DOE) has designated South Korea as a sensitive country, a move linked to concerns over nuclear proliferation and recent political turmoil in Seoul. The classification, made in January