The phrase "suicidal mission" refers to a task or goal that is extremely dangerous or has a high risk of resulting in death or harm to the person undertaking it. Full definition
The Minority in a statement said: «While Ayisi Boateng's apparent suicidal mission in the face of overwhelming condemnation by decent minded Ghanaians has made him the «Chemical Ali» of Ghana's Diplomatic Service, the Minority in Parliament like most Ghanaians believe the ball is now squarely in the court of His Excellency President Nana Addo Dankwa Akufo - Addo to show this dangerous envoy the exit.» (citifmonline.com)
And it comes from unexpected quarters too: even the newspaper's publisher, informed that the Globe is about to embark on the potentially suicidal mission of suing the Catholic Church, just takes a deep breath and says «OK.» (indiewire.com)
I'm digging her so far, and she kind of reminds me of Snake Plissken, the main character of Escape from New York (1981), being a criminal who is forcibly recruited to carry out a probably suicidal mission, albeit as part of a team in this case. (cinemanerdz.com)