So far, the Americans indicted or convicted during the Mueller investigation have nothing to do with Russian conspiracy, nor obstruction. True, Russians and Russian companies have been indicted. That Russia hacked and bought false ads is known. Russia, alone. So far, no conspiracy.
Again, doubtful that martial law would or could be implemented. That's a Democrat dream. Remember, whatever Democrats accuse one of, the Democrats are already committing the thing, or planning to do so.
Very poor understanding of the 25th Amendment, I see. First, the VP and a majority of the cabinet must agree on the removal. The president may disagree, upon which a second vote must be held. If the president still disagrees, it would take two-thirds of both houses of Congress to remove the president.