Well it is 300 thousand Russians, not 10. With the added reserves it is now approaching 500.
And they are armed and aiming to overthrow the government.
They were never allowed in.

The million illegal immigrants are 99% unarmed.
They want to a better life for them and their families. Not to overturn the government.
They are being allowed in.

Spot the differences?

Now of course 1 percent of the million is dangerous armed criminals and whether it is a good idea to allow illegal immigrants into your country is open for debate.
So not saying the mass immigration is a good thing. To the contrary.

However you are comparing two very different things.