Regarding captives, Ukraine claims they've captured 200. Here's the full quote. Note that while it comes via the BBC, it's merely taken from an official Ukrainian facebook page [1]:
> The Ukrainian military has published what they claim is a breakout of Russia's losses. According to a post on its Facebook page, more than 3,500 Russian soldiers involved in the invasion have been killed and almost 200 taken prisoner.
As I pointed out elsewhere in this thread, there may be some misunderstanding/misreporting going on. According to Alexey Arestovich (a military advisor to the office of the Ukrainian president), the 3500 includes both killed AND wounded.
>The number of United States troops who have died fighting the wars in Iraq and Afghanistan had passed 7,000 at the end of 2019.
Still seems to be a lot, not sure if that number from Ukraine includes captives as well.