Russia could try to be VERY nice to Germany's neighbours (for awhile)
Russia has good relations with at least two of your neighbors - Switzerland and Austria.
Hungary and Italy are not your neighbors, and neither is Slovakia - but with them we also have good relations.
We have bad relations with the three Baltic states, for reasons which I think you know.
With Poland it's a special case, because Poland seems to hate us absolutely, whereas we can't really figure out what we did to p*ss it off (1991-2022). The negativity with Poland, has been simply unrelenting after the Smolensk disaster. This despite us supplying billions into the Polish budget through oil and gas transit fees, and that Polish companies flourished in Russia.
I think Poles hate Russians regardless of the weather outside, or time of year. It sits very deep. Not sure what we can do to win Polish support.