Given that the Russian government is protecting him as much as they are, he handed some intelligence over to buy himself some time. That's the most likely manner in which they'd offer him protection.
Not really - it's cheap political theater. He's a highly public figure that the US desperately wants back on US soil - it costs Russia nothing to have him & they gain a lot of 'respectability' points for sheltering a US dissident from the wrath of "an out of control US government". The political points for having Snowden lecture the US on privacy issues & transparency from Moscow are huge - Russia couldn't buy a better venue to tweak Uncle Sam's nose.
"patents they've never disclosed" is kind of a contradiction in terms. Usually the claim is that they haven't disclosed which patents are being cross-licensed.
"Patents they've never disclosed" is acurate. They go to companies using Android and say - "Linux uses our patents, pay us or else.", but they never disclose which patents Linux infringes on - they just take the money for a no-sue promise.
Other things that will set off the detector/test if you handle your lugage at any time while contaminated with them include:
- potting soil, grass patch, plant food, and of course straight fertilizer.
- Cleaning products - anything with amonia in it.
- attending a show with pyrotechnics
- gun powder residue - black or smokeless.
- nitrate based medicines for heart conditions
The list goes on, but the point is, even transporting your lugage in the same trunk as you carried potting soil in 2 months ago is going to get you flagged as a positive. After that, it's going down hill for you.