With the world holding arsenals of nuclear weapons, the risk of nuclear war is now great.
Tensions have been rising with Russian threats around the war in Ukraine. It is just a matter of time before the missiles start flying.
As Russia has struggled to make progress invading Ukraine, President Vladimir Putin has made veiled but pointed threats suggesting he could deploy nuclear weapons.
Experts have told Insider nuclear weapons are likely to be deployed in combat, a move that would put Russia at risk of alienating its allies and its own people. Experts seen evidence of Russia preparing a strike.
Still, though the threat of nuclear war is always present, and world leaders are taking it seriously.
An interactive tool called NukeMap simulates the consequences of a nuclear weapon's impact.
Using updated Cold War models of nuclear explosions, the tool provides an overview of the simulated scale of the devastation from a nuclear bomb in a given place — including a rough estimate of casualties and injuries.
A former Russian diplomat has warned that President Vladimir Putin will sacrifice 10 to 20 million Russian soldiers to win the war in Ukraine.
Speaking to Sky News' Political Editor Beth Rigby, Boris Bondarev said that Putin "understands that if he loses the war with Ukraine, it will be the end of him."
"You should have no doubt about it. He may sacrifice 10 or 20 million Russians just to win this war just to slaughter all Ukrainians because it's a matter of principle. It's a matter of political survival to him."
Responding to a question from Rigby about Biden's cautious responses to Putin, Bondarev said: "When you say that you don't want to provoke a bully, it gives him the wrong signal. It shows him you are afraid of him, and he will escalate further. You must show Putin a clear signal that if he wants escalation, he will get it. You must show that his threats are not working."