Most of the time, with Russian adoptions, you won't even be able to keep the diaper they are wearing on the day you bring them home. Take lots of pictures on your own-they may be your own memories.
As far as mobility impairments-my Claire was 4 when I fell in love with her picture. She's almost 6 now. She has cp-spastic quadriplegia, and still doesn't walk. She gets PT, OT, etc., and has recently had Botox injections. She may walk some day without crutches, she may not. Anyway, since you will be a single parent, here would be the things I would worry about beyond attachment and the regular concerns of 2-parent families:
Therapies-scheduling. She will probably qualify for Early Intervention, and get services (including busing)through your local school district for free.
Specialists-scheduling-will eat up all of your personal and sick days at work. This includes evaluation for private therapies and school services. She'll also need to be seen by a neurologist or a cp clinic if you're near a big city.
The good news:
She'll (probably) qualify for medical assistance, which will pay for any and all therapies/copays/and equipment that your insurance won't cover.
As far as the trip home, I went to Korea myself for Claire. She didn't have any kind of mobility equipment. I took and umbrelly stroller which I used sometimes. However, Claire was small (27 lbs. -I bet your little one is tinier, being from Russia). I found it easiest to transport her around Korea and the airports using a hip sling/Snugli type of contraction from Target. You need to do some kind of weight training beforehand, because it's harder than you think (I carried Tommy around the house for small amounts of time before leaving for Korea

). Take aspirin, but you'll be able to handle it.
As soon as you get her home, get her signed up for EI services, and get her on medical assistance. The equipment takes a while. A stroller will be fine for now-Claire is almost 6, and we're only now moving to a wheelchair stroller out of a stroller.
Best of luck. What I can tell you is that I knew that she was mine, and now that she's home-there's no doubt she was!
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Katrina, PROUD MOMMY OF 3!!!!!!
Mom to two boys, 8 and 5, adopted from Moscow, and
Mom to a 6 year old girl, adopted from Seoul.
Special needs mommy with experience with FAS, dyslexia, ADD, FAE, CP/spastic quadriplegia, global developmental delay, and so in love with my kids it hurts!