You are not connecting as you have separate tickets and all the implications of that.

You do not have 2 hrs 50 mins to make the transfer you have that LESS the checkin/bagdrop close time as per Aeroflot's policy. I’d say this would be an hour before so you’d have 1 hour 50 maximum.

Aeroflot will almost certainly not just rebook you if you miss your original flight. They would likely charge you a full fare walk up ticket price,

And Jet Blue won’t be responsible either.