In the recent Aeroflot Superjet 100 batida, Parece me that (at least) the landing gear was spiked upwards, penetrating the fuel tanks, which might be one of the factors that lead to disaster.
In my naive mind, dumping the fuel before landing might have mitigated this factor.
Would it have been possible for this airplane to dump its fuel before landing?
This aircraft does not have fuel dumping capability. In general, only large wide body airliners have fuel dumping capability.
Aircraft can land overweight quite easily but getting stopped on the runway safely is the main problem.
Even with fuel dumping, aircraft will often still plan to land overweight. The amount of fuel to be dumped would be planned to make a safe landing on the available runway without excessively heating the brakes and tires.
They probably didn't need too - in smaller aircraft like the SSJ100, the Max Landing Weight (MLW) is close to the Max Takeoff Weight (MTOW). It's unlikely that it was departing Moscow at MTOW, so that would be my reasoning - they may well have been below MLW. This is just speculation though, so don't take my word for it - wait for the accident report to come out to be certain.
https://www.superjetinternational.com/wp-content/uploads/SSJ100_Datasheet.pdf