What are good synonyms to "not to speak of"?

I wanted to use some other phrase for "not to speak of". What could be a good synonym for that? For example,

"international community" is a political contrivance; it doesn't exist! And what doesn't exist cannot act, not to speak of influencing Russia's policy.

Thanks.

Solution 1:

I can suggest "not to mention" or "to say nothing of" which sound more common to my ears.

e.g.

• "I don't think it's worth visiting it, not to mention the cost of the trip."
• "They own a magnificent mansion at the Cape. To say nothing of their bank account."

Solution 2:

Is this useful?

And what doesn't exist, cannot act, not to speak of inlfuencing Russia's policy.

And what doesn't exist[,] cannot act, let alone influence Russia's policy.

And what doesn't exist cannot act; even less can it influence Russia's policy.