https://www.wearethemighty.com/mighty-culture/least-conquerable-countries/
https://www.youtube.com/watch?v=RsHtT0uEySI
https://www.youtube.com/watch?v=G60AhM7pPz0
https://www.bartleby.com/essay/Why-Is-Russia-Hard-to-Invade-FKW6CK4KRZZS
https://www.iwm.org.uk/history/operation-barbarossa-explained-why-hitler-failed-to-defeat-russia
https://www.vice.com/en/article/9bza77/we-asked-a-military-expert-how-to-invade-and-conquer-russia
https://worldpopulationreview.com/country-rankings/largest-countries-in-the-world
https://www.reuters.com/world/europe/temperatures-siberia-dip-minus-50-celsius-record-snow-blankets-moscow-2023-12-04/
https://www.globalfirepower.com/country-military-strength-detail.php?country_id=russia#google_vignette
https://www.statista.com/statistics/1103711/russia-food-self-sufficiency-rate-by-category/#:~:text=Grains%20were%20the%20agricultural%20product,except%20for%20fruit%20and%20berries.
https://www.globalfirepower.com/country-military-strength-detail.php?country_id=china
https://nationalinterest.org/blog/reboot/why-us-military-will-never-invade-china-198743
https://www.reuters.com/world/asia-pacific/bigger-heavier-faster-china-rolls-out-military-upgrades-2023-09-21/
https://www.wsj.com/articles/china-defense-spending-senate-bill-angus-king-dan-sullivan-u-s-beijing-military-c3b64ba
https://www.aei.org/op-eds/chinas-real-military-budget-is-far-bigger-than-it-looks/
https://papers.ssrn.com/sol3/papers.cfm?abstract_id=1957955
https://www.globalfirepower.com/country-military-strength-detail.php?country_id=mongolia
https://www.reuters.com/world/asia-pacific/mongolias-east-west-balancing-act-buffeted-by-russian-invasion-ukraine-2022-03-03/
https://www.theguardian.com/world/2022/may/31/mongolia-under-pressure-to-align-with-russia-and-china
https://www.nationalgeographic.com/science/article/140310-genghis-khan-mongols-mongolia-climate-change
https://www.lse.ac.uk/ideas/events/2023/03/Mongolia-China-20/Mongolia-China-Relations-in-2023-Border-Reopening-and-Other-Development
https://thediplomat.com/2023/04/explaining-democratic-mongolias-strong-ties-with-russia-and-china/
https://www.bbc.co.uk/bitesize/guides/z342mp3/revision/4
https://www.history.com/topics/vietnam-war/vietnam-war-timeline#america-enters-the-vietnam-war
https://history.state.gov/milestones/1953-1960/dien-bien-phu#:~:text=On%20May%207%2C%201954%2C%20the,pulled%20out%20of%20the%20region.
https://www.hoover.org/research/1979-sino-vietnamese-war-and-its-consequences
https://history.princeton.edu/undergraduate/princeton-historical-review/2021%E2%80%9322-issue/saturated-jungle-and-new-york-times
https://www.historic-uk.com/HistoryUK/HistoryofBritain/Britains-Retreat-From-Kabul-1842/#:~:text=Terry%20Stewart&text=8%20min%20read-,The%20inhospitable%20terrain%2C%20the%20unforgiving%20and%20unpredictable%20weather%2C%20fractured%20tribal,to%20Britain’s%20downfall%20in%20Afghanistan.
https://www.history.com/news/1979-soviet-invasion-afghanistan
https://www.cfr.org/timeline/us-war-afghanistan
https://www.hoover.org/research/1979-sino-vietnamese-war-and-its-consequences
https://history.princeton.edu/undergraduate/princeton-historical-review/2021%E2%80%9322-issue/saturated-jungle-and-new-york-times
https://www.aljazeera.com/news/2023/8/15/taliban-marks-two-years-since-return-to-power-in-afghanistan
https://www.history.com/news/why-its-so-difficult-to-win-a-war-in-afghanistan
https://theswisstimes.ch/why-swiss-borders-were-rigged-to-blow-at-any-moment/#:~:text=Switzerland’s%20natural%20environments%20were%20extensively,throughout%20the%20tiny%20Alpine%20country.
https://www.thedailybeast.com/the-secret-military-fortresses-hidden-in-the-swiss-alps
https://finabel.org/switzerland-reintegrates-bunkers-into-the-national-defence-strategy-due-to-russo-ukrainian-war/#:~:text=There%20are%20currently%20about%208000,(Allen%2C%202023%2C%20para.
https://www.timeout.com/switzerland/things-to-do/swiss-bunkers-tours-and-museums
https://www.globalfirepower.com/country-military-strength-detail.php?country_id=united-states-of-america#google_vignette
https://www.statista.com/statistics/249740/percentage-of-households-in-the-united-states-owning-a-firearm/#:~:text=The%20share%20of%20American%20households,one%20gun%20in%20their%20possession.
https://en.wikipedia.org/wiki/List_of_militia_organizations_in_the_United_States
https://www.britannica.com/place/India/The-Himalayas
https://www.cnn.com/2016/05/20/asia/india-record-temperature/index.html
https://www.globalfirepower.com/country-military-strength-detail.php?country_id=india
https://www.gisreportsonline.com/r/china-india-border-2/