Easy - I'm not sure it'd be easy.
Repeat the 80s - the USSR of the 80s and Russia of the 2010s are different entities, with perhaps slightly different foreign policies, leading to different situations.
Putin sees Crimea as Russian, not part of independent Ukraine. He may feel the same way about other areas of land which border the Russian Federation. OTOH In the 80s, Ukraine, Crimea and the Baltic states were all ruled by puppet leaders installed by Moscow, so no need for power grabs and shelling there.
Recognise that Russia is acting as an enemy and adjust
Make CLEAR AND CREDIBLE threats
Declare sanctions can't be lifted without serious Russian concessions - ok, these three points sound like good suggestions. Would they have stopped Putin from annexing Crimea, had they been in place?
This worked when Russia was a superpower - I think you mean when the USSR was a superpower? I think we should be careful not to conflate the Russia of today and the USSR of the 80s.
Make CLEAR AND CREDIBLE threats - such as?