Technically, modern Russia has no Church / State separation, and this could be worked out. The Orthodox church is the State church.
1. The Russian Federation is a secular state. No state or obligatory religion may be established.
2. Religious associations shall be separate from the State and shall be equal before the law.
It is the Constitution of the United States of America which technically does not mention "separation of church and state." You also won't find the word "secular" in the US Constitution.