I've just read this comment on another forum and thought it might help some regarding the nuclear worries. It's helped me so I wanted to share so others with similar anxieties surrounding this can read...
"Unless there's some unforseen psychology or physical ailment Putin has that we don't know about, he will not risk the world, let alone his country to nuclear annihilation. So this business about him putting us in our place is purely symbolic, and part of his rhetoric. He wants us to fear him, but since the start of this conflict, he's lost that element against the rest of the world.
The only way I see him pressing the big red button is something akin to an order Hitler gave when he knew he had lost. He ordered his commanders to destroy everything, bridges, roads, infrastructure, anything the bore any resemblance to his dystopia. Sort of "my country failed me so it shouldn't exist."
Russia is far from this point, despite all the sanctions.
A lot of people see WW3 as a nuclear war, and while there is the very real possibility that it will be, at least to some limited capacity, I think countries will actively try to steer away from the use of nuclear weapons. They will all want to come out on top, and they can't do that over a pile of radioactive ruble rubble."
"By the time he's desperate enough to use nukes, he's lost the support of the military and they're not going to let him launch one."