[phreeza]

Not really a huge margin, Roskosmos launched 2 on February 14, 1989, from the same launch site.

Edit: Also just read that on the same day, the first GPS satellites were also launched from the US.

[ta1243]

I guess 3 instead of 2 would be a 50% increase, which could be counted as a "huge margin".

[phreeza]

It's also the smallest possible margin ;)