Atlantic Ocean
no states
There are 3 states along the eastern border of New York State. They are Massachusetts, Vermont and Connecticut.
Alaska and Hawaii do not border any other state.
the state that shares a border with Russia
Atlantic Ocean.
More states border the Atlantic Ocean than do the Pacific Ocean. There are 14 states that border the Atlantic and only five that border the Pacific.
Missouri and Tennessee border eight states, the most of any.
At the beginning of the US Civil War, the "southern" border States were Kentucky and Missouri. In this answer, Maryland is excluded in that although it was a pro=southern slave State, it cannot be considered a border State.
Every state borders another except Alaska and Hawaii. Alaska does, however, border Canada; while Hawaii is an island. The continental state with the least borders is Maine, at one state, while the states with the most border states are Missouri and Tennessee, at eight states.
Delaware (perhaps the most overlooked border state), Kentucky, Maryland and Missouri were the border states that did not secede from the Union.
No US States have a border with the country of France.
In the Border States the percentages of slaves was that of 14,25%.