How Russia's war with Ukraine led to the suspension of relations between Oak Ridge and Obninsk
https://www.msn.com/en-us/news/world/oak-ridge-and-russian-town-were-sisters-then-covid-ukraine-war-disrupted-the-friendship/ar-AA1iKAOv
COVID stopped a lot of trips, as it says in the article.
Visits to Russia can end up with someone held as a spy and trade barter. They should do everything virtual and save money.