Short answer is no, but the longer answer is far more interesting.
First of all, if you're looking at a simple, knock down, drag out fight with the military in question, let's assume you need equal numbers to the military in question.
There is a really cool graph out of the world bank that shows the percentages of population in the military across the world, and by country, over time. The current average is around 0.9%, but let's assume that you want to get 1% of Russia's population being made up of your fifth column.
Russia's population is currently around 145m, meaning you need 1.4m, maybe 1.5m sleepers in the country. Based on some statistics I pulled off the internet, in 2017 Russia admitted around 250k immigrants that year.
Based on this model, assuming you can take EVERY immigration place in the Russian admission program, it's still going to take you 6 years to embed your sleeper force.
BUT; if you want an army and not a network of terror cells, you also need equipment. You need guns (of course), possibly tanks, planes, missiles, and LOTS of computers. You need infrastructure like training bases, etc. Otherwise, all you're doing is engaging in a guerrilla war in the streets, and that's still going to need lots and lots of small arms.
BUT; you also need a plan. Just going street to street and taking the country is (in a word) dumb. You want to take critical infrastructure, especially communication infrastructure, and neutralise your enemy's capacity to fight back. That means taking their bases et al. For that, you really want to embed your army in their army.
That means infiltration, having kids that are born in Russia, and getting them ALL to join the military. That's on average a 30 year investment or so to get the outcome you're after.
I'd argue that there's more efficient ways to do it, but it does have one single benefit that ties in nicely with Sun Tzu; you'd have your army literally living off the enemy lands once you've started your covert invasion.