https://www.hks.harvard.edu/publications/what-happened-sovie...
https://ahf.nuclearmuseum.org/ahf/history/post-cold-war-worl...
There are reports that much of the tritium in Russian nukes has been stolen and sold on the black market. When you have a culture that is basically a kleptocracy, few internal controls, and tritium prices of $30K/gram, it doesn't take a genius to figure out where the incentives lie.