Dmitry Medvedev warns that if the ​UK trains service members in ​Ukraine, they will be considered legal targets.  https://www.theguardian.com/world/live/2023/oct/01/russia-ukraine-war-live-joe-

Former Russian leader Dmitry Medvedev has responded to UK Defense Secretary ​Grant Shapps' comments about potential UK military training and production in Ukraine. Medvedev warns that if British trainers are inside Ukraine, they will be seen as legal targets for Russian armed forces. He also criticizes the head of the German defense committee for suggesting Ukraine should use long-range missiles against Russian targets, saying that such attacks on German factories where the missiles are made would be consistent with international law. Medvedev accuses NATO countries of actively pushing the world towards a third world war.