For Russia we would be in Top 3 most important allies.
Depending on your view on things, Russia's top allies currently could either be:
1) Belarus
2) Kazakhstan
3) Kyrgyzstan
, or:
1) China
2) North Korea
3) Iran
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The first three are "closest", because they exist together with us within the Eurasian Economic Union. They are members of our ODKB defense bloc. We have no internal borders for movement of labor or goods. There are several multinational institutions, like development banks, and joint commissions. They have large Russian speaking populations, and host important Russian military assets.
The alternative grouping are "closest", because they are the ones with actual weight. North Korea supplied us supposedly 12 million 152mm artillery shells, while the West struggle to provide Ukraine 3 million over 3 years. Iran transferred us ballistic missiles and drones. China provides us with hundreds of billions of dollars in hard currency, and makes their industry available for our needs - down to Russian defense companies opening plants in China, staffed by Chinese citizens.
For Poland to find itself a place in the top 3 - it either has to integrate as tightly as Belarus and Kazakhstan, or to become some European Israel - in its capacity to provide Russia with cutting edge weapons and R&D, as Israel does for the United States.
--///-
I think to sweeten the pill for Poland, it can be outsourced leadership within its sphere of influence. Within Central Asia, for example, Russia does not meddle in Kazakhstan's attempts to gain regional leadership over Kyrgyzstan, Uzbekistan, Tajikistan, Turkmenistan. So long as Kazakhstan maintains due loyalty to the center.
The same can be done with Poland. Poland gets to kick around Lithuania and the Slovaks and Hungarians - and the Russians back them to greatest extent possible. In exchange, Poland backs Russia in other arenas.
Central Asia is actually a great example. They are terrified of both Russia and China. They are also worried about Iran. Like Poland they have always tried to balance. Russia is the only one that can afford them some degree of independence and protection from the Chinese Leviathan.