Putin sign new decree making everything nuclear clear for Russia's adversaries

"Russia exercises nuclear deterrence "in relation to a potential
adversary." The doctrine defines potential adversaries as "individual
states and military coalitions (blocs, alliances) that view the Russian
Federation as a potential adversary" that have nuclear weapons or
"significant combat potential of general-purpose forces."
..
In addition, the doctrine separately lists military dangers, which
"depending on changes in the military-political and strategic situation
may develop into military threats to the Russian Federation", for the
neutralisation of which "nuclear deterrence shall be carried out".
Such threats include:
    enemy's possession of weapons of mass destruction that can be used
against Russia;
    enemy's possession of missile defence systems, medium- and
shorter-range cruise and ballistic missiles, high-precision non-nuclear
and hypersonic weapons, drones;
    the build-up of "general-purpose force groups that include nuclear
weapon delivery vehicles" near the borders of Russia or of its allies;
    the creation of missile defence and anti-satellite warfare systems
in space;
    the deployment of nuclear weapons on the territory of non-nuclear
states;
    the creation of new and expansion of old coalitions and military
blocs "leading to the approach of their military infrastructure to the
borders of the Russian Federation";
    actions of a potential enemy "aimed at isolating part of the
territory of the Russian Federation";
    enemy actions that could lead to environmental or social disasters;
    planning and conducting "large-scale military exercises near the
borders” of Russia;
    uncontrolled proliferation of weapons of mass destruction."
https://english.pravda.ru/news/russia/161212-putin-russianuclear-doctrine/