How I switch to the subshell that opened by previous command on remote Linux VM when connected using paramiko on Python?

Question

Few details about my setup:

1. Developing on Python
2. Using Paramiko to SSH connect to the Linux (ubuntu) VM

Problem: When I ssh to the VM I am executing commands while part of the commands are openning a subshell. As a result code hangs and I can't assert, run next commands, finish the execution.

I am looking for solution to switch to the subshell and execute next commands or/and close the subshell and continue code execution.