There have been a lot of private military corporations, mainly U.S. private corporations, that have gone in. They are assisting the Ukrainians with various different training and how to operate, especially in urban areas where a lot of these battles are taking place.
In terms of how many companies and what their strengths are, we do not know at this particular moment, but they are starting to move in there. That's why PMCs were actually put together to go in and assist these countries when these countries didn't have a lot of help from outside their country.