Thousands of Russian scientists and science journalists have put their names to a statement of protest against the “unfair and senseless” invasion of Ukraine.

The online statement was initially published in Russian by the news organisation TRV Science. The statement was signed by leading scientists, including about 25 members of the Russian Academy of Sciences.

They say the blame for "unleashing a new war in Europe" lies "entirely with Russia”.

“We demand an immediate halt to all military operations directed against Ukraine," they add.

They say Russia's actions - and the consequent sanctions it faces from other countries - mean it has "doomed itself to international isolation".

“This means that we, scientists, will no longer be able to do our job normally. Conducting scientific research is unthinkable without full co-operation with colleagues from other countries," the statement adds.