Last year, a death penalty sentence slapped on a Sudanese doctor for refusing to renounce her Christian faith stirred international outrage and heightened calls on the government to increase religious liberty.
Meriam Yahya Ibrahim was released a month later, but now two Christian pastors have been jailed and they also face a possible death sentence.
The Rev. Michael Yat and the Rev. Peter Yein Reith, both from the South Sudan Presbyterian Evangelical Church, have been charged with undermining the constitutional system and spying, offenses punishable by death or life imprisonment.
The clerics are charged with waging a war against the state and assault on religious belief.