The USSR was seriously considering a nuclear strike on China in 1969 before Nixon stated that the USA would nuke 130 Soviet sites in retaliation.
2. The Soviet Union named a crater (McAuliffe) on Venus after Christa McAuliffe, the teacher astronaut who died during the Challenger space shuttle disaster.
3. The USSR renamed its rocket base Baikonur in 1961 to keep the Soviet space program a secret. Residents of the original Baikonur, hundreds of km away, took advantage of the resulting confusion by ordering many valuable supplies for themselves before the scam was discovered.
4. The Soviet Union disapproved of Somalia's 1977 invasion of Ethiopia and so ceased its support of Somalia and started supporting Ethiopia. In response, the United States ceased its support of Ethiopia and started supporting Somalia.
5. The Soviet Union couldn't figure out how to weld titanium without cracking it, so they built 80% of the Mig-25 out of stainless steel.
The USSR built a Skynet-like device (Dead Hand) in the 1980s that would launch a massive nuclear attack without any human intervention if it detected Moscow had been destroyed.
7. From 1929 to 1940, the Soviet Union introduced a 5-day week in a deliberate bid to eliminate religion.
8. In 1973, the USSR missed out on the 1974 World Cup for refusing to play in a Chilean stadium that had been used to detain, torture, and execute political dissidents.
9. The Soviet Union closed down many churches and reopened them as Museums of Atheism dedicated to scientific education and anti-religious exhibitions.
10. In the USSR, when you were sentenced to be "imprisoned without the right of correspondence", it meant you were to be executed.
In the Soviet Union during 1991, voting "none of above" led to new elections with new candidates in 200 races. Boris Yeltsin later said the "none of the above" option "helped convince the people they had real power even in a rigged election, and [it] played a role in building true democracy.”
12. The USSR promoted a pseudoscientific form of agriculture that rejected genetic heritability for political reasons. Up to 3000 scientists critical of Lysenkoism were imprisoned or killed for being "bourgeois", fascist or anti-Marxist saboteurs.
13. Soviet government officials made a deal with Pepsi to allow Pepsi into the Soviet Union, being the first foreign product sanctioned for sale in the Soviet Union. After the fall of the Soviet Union, Coca-Cola was favored because Pepsi was associated with the Soviet Union.
14. The USSR refused to host the 1980 Summer Paralympics after the Moscow Summer Olympics. An official claimed "there are no invalids in the USSR"; the games were held in The Netherlands instead.
15. USSR built a prototype amphibious plane (Bartini Beriev VVA-14) to hunt American submarines. It could take off vertically, sail on water, fly at high-altitude, land on runways or water, and would eventually have used 'ground effect' to travel.
In 1974, the Soviet Union launched Salyut 3, a crewed military satellite armed with a 30mm 'self-defense' cannon. It was fired several times and even used to destroy a test satellite in orbit. It remains the only armed, crewed spacecraft ever flown.
17. In 1976, the Soviet Union developed keyloggers for IBM Selectric typewriters tracking the ball motion and transmitting content from American Embassy typewriters for years.
18. In 1940, the Soviet Union shot down a civilian Finnish flight traveling from Helsinki to Tallinn. To help preserve peace the Finnish government hid the fact for over a year.
19. The Soviet Union built chemical, nuclear, and biological defenses into its T55 battle tank. This would allow the crew to survive nuclear fallout if required.
20. USSR's first nuclear submarine was morbidly nicknamed 'Hiroshima' due to its accident-prone nature and the fact that 10 people died during its construction.
21Late for work
In the Soviet Union under Stalin, being more than 20 minutes late for work was a criminal offense.
22. During World War 2, the Soviet Union trained dogs to blow up German tanks. Their usage was later discontinued, as the dogs tended to ran back to the familiar smell of Soviet soldiers and tanks, killing them instead.
23. In the USSR, vodka produced by the state-owned brands used to come in half-liter bottles which once opened couldn't be recapped.
24. In 1972, Soviet Union’s eavesdropping of communications calls between American wheat farmers and the Department of Agriculture led to “The Great Grain Robbery” that enabled the Russians to covertly buy record amounts of wheat at low prices, causing a U.S. grain shortage 18 months later.
25. The Soviet Union disguised their flamethrowers to avoid sniper targeting during World War 2.