Ukraine crisis: Your questions answered by BBC reporter James Waterhouse
You may have heard a lot of talk in the news right now about two countries, Ukraine and Russia.
Some people are worried because Russia - one of the most powerful countries in the world - has gathered more than 100,000 soldiers on the border with Ukraine, with fears that this could lead to a war.
But Russia has denied the claims, saying the troops are just conducting military exercises.
Countries such as the UK and US say they're waiting to see what happens next.
BBC Reporter James Waterhouse is in the Ukraine capital Kyiv and has been answering your questions.
Find out more about what is happening in Ukraine in our guide here.