Finland's plans for China are none.
While I was in Ukraine. Plans for Karelian Independence was some.
Russia would find it 'harder' to fight Finland, if Karelia put a spanner in its works.
Russia would find it 'harder' to do anything if 'Yellow' China came 'officially' marching into its lands like the Soviets did to it long ago.
China has already usurped Russian lands. It has 500,000+ citizens and military people already inside Russia like a good 'ally' should. It tried this with India, but its not working as well. India puts up a fight. Putin just puts up with it and the best he can do is try to 'offer' FREE land, buildings, houses to white Russian citizens to move out and reclaim, but white people are too scared to mix it with the Yellow Hordes.
China has already 're-taken' islands and other 'disputed' parts from the Soviet era. Just this year - they just waltzed in and mobilised on some Russian land in the eastern parts. Putin did and said nothing - like a good 'ally' and maaaaaaaaaaaaate.

If China had to make a choice as to who to war with 'directly'? It would be Russia, not the USA. Russia is now the easy bit, it's not the potent USSR anymore. Siberia is rich in resources, has yellow people in it and gives the Yellow Man an official passage to the north finally. China wants Siberia (Oil !!!).
Russia will be at a loss having to fight a NATO Europe on one side and China on the other. Not even its ally in India would be able to do much to help as it will have its hands full with China who has got Pakistan and Bangladesh to flank it.
It's complicated, but in a way - it's not.
Russia's great era (and it was great) is almost at an end.
The Master Plan of White Man moving into the East and Crusading into the Middle-East to remove Yellow and Brown people, is coming to an official 'end'. No more 'entire white northern hemisphere' (Yin/Yang).
...you see. 'Australia' and Oceania have put a spanner in the works there.

White people have to go 'down under' to get across.