Russia has no good diplomacy. Russian diplomats = spoke persons of generals. It works sometimes, obviously, but only because of military strenght.
Not agree here. Russia has good and old school of diplomacy and intelligence. The important thing that even very good diplomacy always has limited potential without military backup. Effectiveness of American diplomacy compared to, say, Spanish is much higher. It doesn't mean Spain has bad diplomats.
I don't mind it having its sphere of interest in the meaning of polish, german, french etc spheres of interest - that it places Russia has many ties with and is interested in what happens there.
But for Russia's leaders sphere of interest = vassal states.
It would be much better for both Poland and Russia, to have relations the same as Russia has with Japan. Not very good, but at least working, and much less emotional.
I can assure you that Poland, as sphere of interest, considered in modern Russia the same as Germany or Japan - we have neither wish nor possibility to "vassalize" Poland. Also, both countries must understand trade interests and security concerns of each other.
More or less agree with your other points.