Russia is going to seal off its border and halt all trade with Ukraine.
This is unfortunate but to expected. No country would tolerate anarchy spilling over its borders.
If events in Kiev take a dangerous turn, this is the likely outcome.
Not only anarchy. Protests are clearly anti-Russian in it’s nature and it makes perfect sense for Russia to sanction a country allowing it. Georgia comes to mind. Saakashvili has campaigned on anti-Russian agenda at the time but was surprised to find his nationals (1 in 5 Georgians were working illegally in Russia sending their paychecks home!) deported and Georgian imports to Russia (80% of Georgian exports) banned. He has responded supporting Chechen terrorists, supplemented economic losses with US aid but the rest is still history.