@Metal-Brain
So tell me how many Apollo astronauts died from radiation poisoning.
The real danger is the months long trip going to Mars, if they run into a coronal discharge, they are toast and will be dead when they get ready to dive into Mars atmosphere.
But the chances of that are not that great so that fact will not deter them, whatever country attempts it, Russia, China, US, and now India, or even Israel, they will ALL face that danger.
They can't afford the radiation shielding to help not because of money but because the mass would make it much more difficult for an already difficult job of getting to Mars safely in the first place.
Those craft have to be light because of the need to lift all that crap up into orbit and then on to Mars and probably later on from factories on the moon which has a lot less gravity and therefore much less force needed to boost such craft to the velocities desired to go to Mars.
Another development by NASA is the fusion rocket and a nuclear powered rocket, two distinct technologies, the nuclear one will allow a craft to get to a half million miles per hour, near ten times faster than chemical ones and fusion would be even faster but that is not now, probably 20 years in the future or later.
Assuming your god Putin does not start an atomic war, we may last long enough as a civilization to get all those technological wonders.
The idea behind those atomic powered rockets and even versions powered by solar energy is to have a lot less thrust but 24/7 so the velocity builds up slowly but surely as opposed to boosters of today where they poop out in a half hour or so and you coast the rest of the way except for mid course corrections and the like.
If we can manage 1/20th of a g of accel, we can get to Mars in about a month compared to 6 or 7 months it takes now with chemical rockets.
If we can get to 1/10th g accel (and of course full time, 24/7) we can get there in a couple of weeks, accel full time till half way there, then kick the rockets around to slow down and you get to Mars with zero change in velocity needed since that would be inherent in the thrust of the propulsion.
That makes it a lot easier to transverse the Mars atmosphere which, even though it is 1/100th or so of our atmospheric pressure, it is still enough to burn up any craft entering without rigorous design of heat shields.
When you get there with zero delta velocity the heat shield requirements go way down so that will be a win win win, first by not having to be in space for 7 months so that much less likely to encounter a coronal discharge and much higher average velocity and zero velocity compared to Mars when you get there so the entry into Mars atmosphere is much easier.