Had it not been for the interference of both the USA & Russia with her threats to transfer atomic arsenal to Egypt for a possible show-down , with the USA ?. At that time frame America sent a warning to Russia & ordered an emergency. The Russians backed down, similar to the Cuban crisis when Kruschov ordered his ships to turn round, They were armed with atomic missiles. This was the closest to WW3. Conclusion: Don't back down in face of threats. Israel has been pushing threats coming from at least two sides for the last sixty-five years.
Russian official: Nusra Front could be behind attack on Syrian refugee camp (Reuters)
from the article: 44 dead as divided Egypt marks 40th anniversary of Yom Kippur War