Oh, that'll work. /s
It might.
The State Department has notified the Russian Interior Ministry and the FSB that they want Snowden deported back to the USA or surrendered to US authorities in Moscow (the CIA station chief at the US Embassy there).
Best thing to do is red-flag him on INTERPOL, and that might be next; that only takes one phone call to INTERPOL HQ.
If I were POTUS, I’d pull a Reagan and intercept the jet he’s on and force it to land either in the US or a friendly country and take him into custody.
I don’t think it’d stop Snowden either, but it definitely makes it that much harder for him not to make a mistake. It’s only one piece of the puzzle of how he’ll end up back in US hands.