If a friend without amateur radio certification is using your station to talk to someone in Canada, and a foreign station breaks in to talk to your friend, what should you do?

In Canada, an uncertified person may operate an amateur radio station as long as a certified operator is physically present and strictly monitoring the operation. This rule applies regardless of whether the communication is domestic or international. The certified operator remains legally responsible for all transmissions originating from their station. Therefore, there is no need to panic, sign off, or physically take over the microphone just because a foreign station breaks in. Distractors suggesting you must shut down or take over the conversation are incorrect because Canadian regulations do not forbid foreign contacts by an uncertified person, provided the control operator is continuously supervising.