300 is the gematria of Elohim, the attribute of strict justice, in its “filled” form (when every letter is spelled out).
Negative forces of impurity (klipot) draw nourishment and sustenance from this name when the Jewish people transgress (the name itself is entirely holy). These klipot act as barriers between the Jewish people and haShem.
Possibly, a hint of this spiritual reality is reflected in Russia’s efforts to arm Iran with the advanced S-300 air defense system. This weapons system is, in essence, a barrier intended to stop the Jewish people’s efforts to protect themselves from harm.
HaShem should help us do tshuva that will remove all barriers between the Jewish people and our King. Our efforts to remove the barriers “above” will surely remove the barriers “below.”
Our heartfelt prayers for salvation should surmount all barriers and be answered and fullfilled, soon, in our days.
Have a Healthy and Sweet New Year!