Triple

Given a phrase, classify it is english named entity (e.g., persons, organizations, works of art) in Latin script, or not (e.g., literals, dates, URLs, verbose phrases). For disambiguation, the statement where the phrase occurs as object is also given. Please return a JSON object with `phrase` (string, the phrase being analyzed) and `is_ne` (boolean, indicating whether the phrase is a Named Entity).

Phrase: Soviet–Mongolian border agreements (20th century) | Statement: [Russia and Mongolia, borderDemarcationTreaties, Soviet–Mongolian border agreements (20th century)]

Target entity: Soviet–Mongolian border agreements (20th century)
Context triple: [Russia and Mongolia, borderDemarcationTreaties, Soviet–Mongolian border agreements (20th century)]

• A. Treaty on the Russian-Chinese Border (1991)
  The Treaty on the Russian-Chinese Border (1991) is a post–Cold War agreement that settled major sections of the long-disputed frontier between Russia and China, laying groundwork for improved bilateral relations and later border accords.
• B. Supplementary Agreement on the Eastern Section of the China–Russia Boundary (2004)
  The Supplementary Agreement on the Eastern Section of the China–Russia Boundary (2004) is a bilateral treaty that finalized and clarified the remaining disputed segments of the eastern land border between China and Russia, helping to normalize and stabilize relations between the two countries.
• C. Russia–China border
  The Russia–China border is the long international boundary separating the Russian Federation and the People’s Republic of China, stretching thousands of kilometers across rivers, mountains, and remote terrain in Northeast and Central Asia.
• D. Sino–Soviet border negotiations of the 1970s
  The Sino–Soviet border negotiations of the 1970s were a series of diplomatic talks between China and the Soviet Union aimed at easing tensions and resolving longstanding territorial disputes along their shared frontier after years of armed confrontation.
• E. Curzon Line
  The Curzon Line was a proposed demarcation line between Poland and Soviet Russia after World War I that later served as the basis for the post–World War II eastern border of Poland.
• F. None of above. chosen
• G. Unsure - the case is ambiguous/there is not enough information to decide.

Generate a one-sentence description of the target entity. 
You are given a context triple in the form (subject, predicate, object), where the object is the target entity. 
# Instructions
Use the triple to infer relevant information about the entity. Describe the entity based on what is most defining, well-known. 
Avoid repeating the information from the triple, unless really essential.
# Response Format
Return only the sentence: "Description: [one-sentence description of the target entity]"

Entity: Soviet–Mongolian border agreements (20th century)
Triple: [Russia and Mongolia, borderDemarcationTreaties, Soviet–Mongolian border agreements (20th century)]

The Soviet–Mongolian border agreements of the 20th century were a series of treaties that formally defined and adjusted the frontier between the Soviet Union and Mongolia, shaping the modern boundary between Mongolia and Russia.

Target entity: Soviet–Mongolian border agreements (20th century)
Target entity description: The Soviet–Mongolian border agreements of the 20th century were a series of treaties that formally defined and adjusted the frontier between the Soviet Union and Mongolia, shaping the modern boundary between Mongolia and Russia.

• A. Treaty on the Russian-Chinese Border (1991)
  The Treaty on the Russian-Chinese Border (1991) is a post–Cold War agreement that settled major sections of the long-disputed frontier between Russia and China, laying groundwork for improved bilateral relations and later border accords.
• B. Supplementary Agreement on the Eastern Section of the China–Russia Boundary (2004)
  The Supplementary Agreement on the Eastern Section of the China–Russia Boundary (2004) is a bilateral treaty that finalized and clarified the remaining disputed segments of the eastern land border between China and Russia, helping to normalize and stabilize relations between the two countries.
• C. Russia–China border
  The Russia–China border is the long international boundary separating the Russian Federation and the People’s Republic of China, stretching thousands of kilometers across rivers, mountains, and remote terrain in Northeast and Central Asia.
• D. Sino–Soviet border negotiations of the 1970s
  The Sino–Soviet border negotiations of the 1970s were a series of diplomatic talks between China and the Soviet Union aimed at easing tensions and resolving longstanding territorial disputes along their shared frontier after years of armed confrontation.
• E. Curzon Line
  The Curzon Line was a proposed demarcation line between Poland and Soviet Russia after World War I that later served as the basis for the post–World War II eastern border of Poland.
• F. None of above. chosen