thumb|right|314px|The 1853 negotiations between Russian envoy, Alexander Sergeyevich Menshikov|Prince Menshikov, and the Turkish Sultan about the protection of Orthodox Christians in the [[Ottoman Empire involved a series of ultimata. On 31 May, Russia threatened that the vassal states of Moldavia and Wallachia would be occupied if Menshikov's note was not accepted within seven days. This Punch cartoon satirises rejection of the ultimatum.]]
thumb|right|314px|The 1853 negotiations between Russian envoy, Alexander Sergeyevich Menshikov|Prince Menshikov, and the Turkish Sultan about the protection of Orthodox Christians in the [[Ottoman Empire involved a series of ultimata. On 31 May, Russia threatened that the vassal states of Moldavia and Wallachia would be occupied if Menshikov's note was not accepted within seven days. This Punch cartoon satirises rejection of the ultimatum.]]
An ; ; : ultimata or ultimatums) is a demand whose fulfillment is requested in a specified period of time and which is backed up by a threat to be followed through in case of noncompliance (open loop). An ultimatum is generally the final demand in a series of requests. As such, the time allotted is usually short, and the request is understood not to be open to further negotiation. The threat which backs up the ultimatum can vary depending on the demand in question and on the other circumstances.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).