Most of the 755 staff are actually Russian citizens.  So Russia is effectively increasing their own unemployment rate.

Also, Russia is responding tit-for-tat to Obama's decision to close Russian diplomatic services and expel their diplomats.

What this shows is the development of a second Cold War.  The US and Russia are at loggerheads over the Ukraine/Crimea, the Baltic States, the Balkans, North Korea, and Syria.  Each country has stepped up provocations against the other -- e.g. flying unsafely close to other aircraft and sending bombers/warships very close to the other country's borders.

At the moment Trump has his hands more than full with the NK/China imbroglio.  He cannot allow the madman, Kim, to have
ICBMs with thermonuclear warheads. 

Sanctions/diplomacy have been tried for decades with the criminal Kim dynasty and these efforts have failed.  Unless a miracle occurs soon, Trump will have to use military force against NK.

Trump is wise not to make matters worse with Putin.