Breaking News: A U2 spyplane has crashed somewhere in 'South West Asia'. In US military-speak this apparently means 'The Middle East'. The details aren't being released due to what's called 'Host Nation Sensitivities'. This seems to imply that the host nation invited the U2 into their airspace. So candidates could include Pakistan, Saudi Arabia, Kuwait, or even Iran. I don't think China is a likely candidate as they'd make a big fuss about the issue - unless of course China are willing to keep quiet because they would have to make a fuss, and don't want things to escalate.
Looking back, Gary Powers crashed a U2 in Russia in May 1960 and was sentenced on 19th August 1960