Merrith
Golden Baronet of the Realm
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Prime Directive
The Prime Directive, also known as Starfleet Command General Order 1, the Non-Interference Directive, or the principle of non-interference, was the embodiment of one of Starfleet's most important ethical principles: noninterference with other cultures and civilizations. At its core was the...memory-alpha.fandom.com
The only show that was ever really consistent about the Prime Directive was TOS, and that consistency was Kirk ignoring however he saw fit.
A little lower down in that link
"Helping a society escape a natural disaster known to the society, even if inaction would result in a society's extinction, unless the society has warp technology and has formally requested aid."
I guess the question could be raised on whether the Romulans formally requested aid, but that probably clears up any other time they were assisting a species with something, including Klingons in Star Trek VI.