What happen if russia use nuclear weapon?
The use of nuclear weapons by any country, including Russia, would have catastrophic consequences for both the targeted country and the entire world. The immediate effects of a nuclear detonation include a massive explosion, intense heat, and a shockwave that can destroy buildings and infrastructure over a wide area.

In addition to the immediate destruction caused by the explosion, a nuclear detonation would also release large amounts of ionizing radiation, which can cause severe burns, radiation sickness, and long-term health effects such as cancer.

Furthermore, the use of nuclear weapons could trigger a global nuclear war and a subsequent nuclear winter, which would have devastating effects on the environment and could lead to the extinction of many species, including humans.

It's worth noting that the use of nuclear weapons is illegal under international law, and any country that uses them would face severe consequences from the international community. As such, it is important that countries work towards disarmament and peaceful conflict resolution to prevent the use of nuclear weapons.
What if I were to go across the entire world and eat all the nuclear weapons?
Are you the Godzilla?

All jokes aside, eating nuclear weapons is not possible. They are not edible and contain highly radioactive materials that are harmful to humans. Even coming into contact with nuclear weapons or their components can be dangerous and potentially lethal.

Nuclear weapons are also heavily guarded and kept in secure facilities. This makes it nearly impossible for someone to access and attempt to destroy them.