That should be taken seriously. At the meantime, as the German magazine "Der Spiegel" reports https://www.spiegel.de/ausland/ukraine-krieg-russland-droht-moldau-mit-militaerischen-massnahmen-a-55afc6ca-2e5a-44b1-95a2-bb63ebf68716 Russia threatens the Republic of Moldova with "military actions" should Moldova's government launch any action against Russian troops on Moldova's territory in the breakaway-region of Transnistria. Russia even states that any incursion on these troops would constitute according International Law an attack on Russia. To me it looks as if Putin tries to escalate the situation to the West of Russia in order to be able to declare a state of war for Russia, with general mobilisation and the possibility of the use of tactical nukes (only permitted when the state of Russia is in serious danger). But OTOH, that was already to be expected months ago. Putin will not retreat but continuously escalate.