What would happen in this scenario?

Say a US plane is flying in Asia and begins having engine problems. The pilots brush it off and try to correct the issue with their training. However, the problem worsens and they know an emergency landing is necessary otherwise the flight could be doomed. However, there's a problem. The only airport closest for emergency landing is Pyongyang International Airport. What would the pilots do in this scenario? Would they actually land in Pyongyang or keep going until they get to somewhere different? Just a weird curiosity I had.

How does checked-in baggage work with layover/multiple airlines?

Will be flying to Romania. I start with Iberia Airlines and layover in Barcelona for about 2 hrs. Then I fly to Bucharest with Blue Air.

Normally when flying with layovers, it's one airline so I know it's forwarded to my final destination. But this is my first itinerary where I switch airlines at my layover; would that mean my baggage is forwarded to Blue Air anyways, or do I need to pick it up and check it in a second time?

How do I go about connecting flights with different airlines?

I'm planning my trip via Skyscanner and some options given are those of connecting flights but with different airlines. If my trip is confirmed, I'm most likely to book via a travel agent where I can pay the full amount even with separate tickets issued.

Now, how do I go about the process of transferring flights? Do I have to go through immigration in the country I'm transiting at, and check-in again to the airline company of the second leg of the flight?

I understand the risks of being delayed on the first leg of the flight/etc. Any ideas what is the minimum transit time I should have to minimise such risks?

Would this cause a hassle?

Hi everyone I've got kind of a weird question but I thought I'd ask anyways. So I'm in a long distance with my boyfriend and we see each other every few months cause I like to fly to his state. Long story short, I have this sex toy that I usually use on myself but he wants me to bring it with me the next time I see him. The problem is, it kinda looks like a bomb. I have included a photo of it to this question so you can kind of see what I mean. If I put this in my checked bag, would it look suspicious on the x-ray? I just don't wanna start a huge fuss at the airport for a sex toy being mistaken as a bomb. Thanks! Would this cause a hassle