The Ukrainian drone attack deep in Russian territory is the reason.
Others are reading now
The Ukrainian drone attack deep in Russian territory is the reason.
What is happening?

Following Ukraines spectacular drone attack deep in Russian territory Sunday, the risk of nuclear war is being raised by Trump and Kremlin aides, according to The Guardian.
Putin pledges revenge

US President Donald Trump and Russian President, Vladimir Putin, had a phone call Wednesday, where Putin, according to Trump, pledged retaliation for the Ukrainian attacks.
Pleading for nuclear response

Russian state media and military bloggers are framing the Ukrainian attack as undermining Russian nuclear stability.
Also read
They use this narrative to argue that a nuclear response would be fitting, with the head of Russia’s soveregin wealth fund, Kirill Dmitriev, warning of the potential for WW3.
MAGA-supporters: We’re closer than in 2022

MAGA-influencers such as Steve Bannon and Charlie Kirk have condemned the Ukrainian attack, with Kirk writing:
“Most people aren’t paying attention, but we’re closer to nuclear war than we’ve been since this began in 2022.”
Risk levels going up

Keith Kellogg, Trump’s envoy for Ukraine and Russia, told Fox News, that “the risk levels are going way up”, explaining that attacking an opponents nuclear triad is a gamble, as you don’t know how the other part will respond.
Risk of direct Russo-NATO-confrontation

According to The Guardian, Dan Caldwell, who was a senior aide to Pete Hegseth at the Pentagon said that the situation has the potential to raise the risk of a “direct confrontation between Russia and NATO.
Russian nuclear threats – again

If you think the sound of nuclear threats coming from Russia sounds familiar, you’re not wrong.
Russia has repeatedly voiced the possibility of using nukes in Ukraine, the first time being when Russian forces were routed near Kharkiv in 2022.