About a dozen of Russian citizens (that I know of) attend their interviews in Warsaw on a monthly basis with zero issues on entering Poland. At least 5 fiancées had their interviews on January 2, 3 and 4.
Mine interview (CR1/IR1) is also scheduled in Warsaw.
The keys for russian citizens are:
1) apply for a tourist Schengen visa with a visa center of loyal countries: Italy, France, Spain or Hungary (in Russia). Act like a tourist don't mention Poland on your application.
2) enter Schengen area by flying in the country that issued you a visa (best option for both short-term and long-term visas, but critical to short-term visas nowadays). Again act like a tourist, you're there for Colosseum or Champs-Élysées.
3) enter Poland by air or by land (train or car) from that European country, even the same day. If by air, buy a separate ticket from that European country to Poland. For example, if you book a ticket Moscow - Istanbul - Rome and a separate ticket Rome - Warsaw, then you enter Schengen area in Italy (go through border control (visa check)), pick up your luggage, check-in, drop off your luggage again and then head to a assigned gate without any additional border control, as there are no administrative borders within Schengen area.
So the citizens of Russia are allowed to enter Poland only from other Schengen country (not through the external border of Schengen zone).
As for interview time frames for CR1/IR1 in Warsaw, NVC usually sends an interview letter in 35-45 days after DQ. An interview date is in 85 days after DQ on average.