Who knows, perhaps stopping all tourist flights to Turkey?
But, this is probably a crucial moment for Putin, will he back down, or step up. My guess is back down. The Russian economy is in free fall:
Stock market down 3 - 4 % so far today http://finance.yahoo.com/q?s=RTS.RS&ql=0
USD/Ruble = 66 and falling
http://www.xe.com/en/currencycharts/?from=USD&to=RUB&view=12h
Oil price 45 http://www.bloomberg.com/quote/CO1:COM
Media is saying Putin to make live statement in the next few minutes.