This is the Guardian.

A year ago this month, Russia invaded Ukraine, sending shock waves around the world.

Loud explosions have been now heard in Ukraine in lots of different cities as the Russian assault has begun. President Biden said that the world will hold Russia accountable

for its aggression. NATO has condemned what it called a reckless and unprovoked

attack. The invasion has been called the biggest threat to European peace and

security since the end of the Cold War. And it's also caused ruptures in the

world of science, threatening decades of carefully negotiated cooperation in the process.

In the Arctic, in space, and at mega labs like CERN, international scientists have collaborated with Russians to push the boundaries of human knowledge.

So what happens if that stops?

From the Guardian, I'm E in sample, and this is Science Weekly.

For decades, Cern, home to the Large Hadron Collider,

has been a paragon of international scientific collaboration,

but the invasion has changed that.

During the Cold War, the Sun was actually a meeting place between scientists and what was at that time the Soviet Union and the West.

And I think that that contact, those contacts through CERN were a valuable channel of communication.

So indeed, I think it's a great shame that now we seem to have

regressed or in danger of progressing to a situation which is even greater isolation than there was during the Cold War.

John Ellis is a professor of theoretical physics at King's College London.

He spent much of his career at Cern. Since 1991, Russia has had observer status

to the Cern Council. So what impact has the invasion of Ukraine had there?

One was, if you like, the impact on the corridors. Obviously there was

general horror among the non-Russian physicists and many physicists, Russian physicists working at CERN, signed statements or petitions against the war.

...