Is Ukraine Surrounded by Russians?

The latest information says that, i think, six or seven war ships, russian warships, are about to go through the turkish straits in order to enter the black sea. So indeed, russians are very strong. Of course, there is a very strong army and 100 forty thousand of troops,. at least on ukranian border er and technologically, in the air space, it's much more powerful. It seems that ukrane doesn't really have a very strong air defense system, right? Ander doesn't e really have a strong fleet, right?