There are massive sanctions globally against products from Russia including Russian oil, crude oil to reduce source of income for Russia and restrict their financial flow for their war against Ukraine.
It is a massive sanction efforts from the Western nations but there are always dark markets and Russia actually have some friendly nations to make business deals like China, North Korea, India and countries from Africa.
However sanctions actually reduce their income and their ability to buy and produce more ammunition, armed vehicles because no sanctions can be perfect in reality.