That would be tricky to uphold, unless stated exacally point after point what need to be done and how and to what extend.
Definitely. I would not expect Poland to put itself in jeopardy on behalf of Russia, but it could be something like the way the Danes, Norwegians, and Swedes coordinate things that are important to them.
Not everything that is "life or death" for Denmark, is important for Norway. But I would expect Norway to at least make some noises to Washington and Brussels about Danish concerns, and how it would be nice to address them.
It's the spirit of the process that matters, more than the practical results - which may be negligible for a while.
open to interpretation. Needs details, for example working with Germany and Russia...
There is, at the moment, perhaps not so much Russia can offer Poland, as Poland may be able to help Russia with. I don't think sharing nukes is a good way to begin.
It's not like Russia can tell Brussels, "F*ck off from Poland regarding your requests to change their constitution, or else we will drop a bomb on your stupid Europarliament." We can't tell Brussels to spare Poland from waves of migrants either.
What Russia can help Poland with, is still very useful, however. The traditional Russian tool of foreign policy - energy. Energy is everything, and we can - for example - let Poland pay the same prices for gas and oil as Belarus. This will represent an enormous tax on the Russian people, but will probably at the same time make Poland the number one economy in Europe within ten years :)
To get Belarus-style energy prices, a lot has to happen however.
Besides energy, Russia can offer access to our large market, which is shared with several other states with an additional 60M people or so. We can make it easier for Polish companies to work there, than for any other EU country.