shocked putin was willing to leave russia...how real is the chance of him being arrested??

Not gonna happen

Zero. The USA doesn't recognize the icj or the ICC.

Zero, since he's only going from Russia to Alaska and back again.

Unless, of course, there's a palace coup in Russia and he gets arrested there when he goes back.

About the same as George Bush Jr or Dick Cheney being arrested. Zilch.

Henry Kissinger was never arrested ever!