Vince Dhimos answered a question in Spanish at Quora:
Will there be war with Russia in Venezuela?
If the United States invaded Venezuela, there would be war, but it is very unlikely that the US would so anything that drastic.
There are several reasons why the United States will probably refrain from military action.
For one thing, Trump knows that if he starts a war and America loses a lot of soldiers and military equipment, such as planes and naval vessels, his chances of re-election next year would be compromised.
Secondly, Trump learned to respect the Russians last April when he announced plans to fire missiles into Syria as punishment for a "chemical attack" in Douma, that probably did not occur.
After this announcement, the Russian Ministry of Defence stated that it would not interfere to prevent the missile attack but that if the US missiles hit any Russian targets, such as personnel or equipment, the Russians reserved the right to destroy the platforms from which the missiles were launched (meaning US naval vessels). Just one month prior to this, in April, Putin had presented a report to the Russian general assembly regarding several new Russian missiles such as the Kinzhal, which flies at hypersonic speed and is capable of destroying targets in the US at a distance of several thousand kilometres within less than an hour and cannot be intercepted by any known means. This made the Pentagon very nervous because indeed the US has no means of intercepting such missiles. Therefore, during this April attack with US Tomahawk missiles, the US military was extremely careful not to hit any Russian targets. The US fear of reprisals was so great that Trump refrained from making such attacks on Syria after that time and attempted to pull out of Syria altogether (this attempt was thwarted by other US officials, however).
It is easy to see that he would also fear making such an attack on Venezuela, where at least 100 Russian troops are currently stationed.
Finally, Reuters has reported recently that Saudi Arabia may stop selling its oil in dollars. It has also recently warned the US to stop imposing sanctions on Russia, its partner in OPEC.
[Link to English language report not cited in my Spanish language response:
[Spanish language article cited originally]:
It would therefore be imprudent for the US to attempt an attack on Venezuela because Saudi Arabia is siding with Russia.
END OF TRANSLATED QUORA ANSWER
My previous articles on this subject:
MOSCOW-RIYADH SUMIT – PETRODOLLAR IN THE BALANCE
UH OH! SAUDIS SIDE WITH PUTIN AGAINST U.S. SANCTIONS