The law could have big implications for the Kremlin's war plans in Ukraine, especially as it tries to recruit thousands more troops in anticipation of a Ukrainian counteroffensive.
Former service members and combat medics from other countries are in Ukraine to train civilians. They typically have just days with new conscripts before they are sent to the front.
Yevgeny Prigozhin, known as "Putin's Chef" because of his company's origins in the catering business, now fields a mercenary army of 50,000. Its role in Ukraine is central to Russia's war effort.