The European Organization for Nuclear Research (CERN) is to cut cooperation with 500 scientists affiliated with Russian institutions from November 30. Around 100 have joined non-Russian institutes in order to continue their physics research work with Europe’s particle-physics laboratory.
There’s yet another meaning of “just” - unrelated to anything else. The comment read like it was dismissing any relation to the war at all. If that’s not what you meant, than fair enough.