The good thing is that there is no one „Western media“, I‘m not asking you to trust exclusively one platform. Still, a news agency backed by a government that is known for spreading misinformation is an agency you wouldn‘t trust, regardlesd of what specific government it is backed by.
Tass doesn‘t have a good track record (as shown - with proof - on Wikipedia), it usually perpetuates the view of the Russian govt. Not a quality anybody should be looking for when seeking out real journalism.