Russia has sent its army to a few nations, such as Afghanistan and North Korea. But it has never tried to invade another nation using its army. Also, it has never tried to topple democratically elected governments.
What will you call Crimea War and annexation of Crimea then?
It was a direct attack and violation of sovereignty of Ukraine. Do you remember what Russia promised in Budapest Memorandum on Security Assurances?
Once Ukraine had the world's third largest nuclear weapons stockpile, they give up this arsenal for the promise of territorial integrity and assurances against threats or use of force against them by Russia.