By Joyce Lee SEOUL (Reuters) -South Korea's leadership crisis will play out in the Constitutional Court, which will decide the fates of President Yoon Suk Yeol and Prime Minister Han Duck-soo, both impeached and suspended from power over a short-lived martial law.

Yoon’s reaction to an uncomfortable opposition’s majority membership in the parliament is the illegal declaration of martial law. This is crude and undemocratic.

The move by acting President Choi Sang-mok aims to restore stability and prevent a credit rating downgrade, following the impeachment of two predecessors.