Government Root CA installed on computer/browser and Man-In-The-Middle [duplicate]

This question already has an answer here:

  • Is there anything preventing the NSA from becoming a root CA? 4 answers
  • How can my employer be a man-in-the-middle when I connect to Gmail? [duplicate] 5 answers

Some countries already have their government Root CA installed on computer/browsers. Is it possible for these countries to read Google etc. mails by using Man-In-The-Middle or similar technique(s)?