Why did Washington show its outlaw face to the world?
Was it to show that as strong as Russia is, Russia cannot protect herself from Washington? No international law, no diplomatic immunity can stand in Washington's way. Washington can violate all law with no consequence.
Washington's view is that might, and only might, makes right. Law is thrown out of the window, so why does Russia rely on law in her dealings with Washington?
Was it to plant some fake evidence in the Russian properties of Russian complicity in the US presidential election that elected a candidate that prefered peace over conflict with Russia?
Russia's foreign minister Lavrov has told the US Secretary of State that Russia is going to sue over the seizure and search of Russia's diplomatic properties. So, here we see again the Russians trying to deal with Washington through law, courts, diplomacy, whatever, and not facing the real issue.
What is the real issue?
The Real Issue is that the US military/security complex, the most powerful component of the US government, has decided that Russia is the ENEMY that justifies its $1,000 billion annual budget and the power that goes with it.