Is it permissible to interrupt an obligatory prayer upon being surprised by a patrolling surveillance team, and is it permissible to combine a full day and night's prayers to perform them after completing the mission, due to the circumstances of security work that demand absolute vigilance and discreet prayer?

It is regrettable that a Muslim Arab country prevents people from praying. Allah has forbidden obeying those who prevent prayer, for prayer is the last bond of Islam to be undone. And whoever abandons it intentionally, is disavowed. Therefore, it is obligatory to preserve prayer and seek another job that enables one to uphold the religion, unless there is a general benefit for Islam in remaining. It is permissible to interrupt prayer if surprised by a patrol, fearing harm, and then pray it afterward within its time. It is not permissible to combine prayers of a day and night to perform them after work ends.