Increased NATO military exercises near Russia’s Kaliningrad Region and aggressive rhetoric from members of the US-led bloc are raising the risk of a direct armed conflict, Moscow has warned.

Russia has sent NATO a warning stressing its determination to protect the Russian exclave in the Baltic region “with its entire available arsenal,” according to a statement published on Monday by the Russian Embassy in Belgium, which hosts the bloc’s headquarters.

The message alluded to remarks made earlier this month by Polish Foreign Minister Radoslaw Sikorski, who said there are “hardly any troops” in Kaliningrad Region and urged NATO to increase its military posture near Russia’s borders so that Moscow would be “uncertain of what we will do.”

NATO spokesperson Allison Hart confirmed receiving the Russian message and accused Moscow of irresponsible rhetoric.

”We strongly denounce the threat of force, including any irresponsible nuclear rhetoric,” she said.

Western officials have frequently described Russian statements invoking its nuclear deterrent as “blackmail,” while presenting NATO’s own nuclear-sharing arrangements as a pillar of collective defense.

France has offered to discuss the possible deployment of its nuclear weapons in other European NATO countries, arguing that this could reduce the bloc’s dependence on the US. Under NATO’s existing nuclear-sharing arrangements, American nuclear bombs are stored in several European countries, while personnel from non-nuclear member states train for missions involving their potential use.

Russia has repeatedly rejected Western claims that it intends to attack NATO before the end of the decade, describing such warnings as warmongering aimed at persuading voters to support sharply higher military spending.

Moscow, in turn, views NATO’s military preparations as potentially paving the way for an attack on Russia. Foreign Minister Sergey Lavrov has repeatedly warned that any such conflict would be extremely brief, implying that Moscow could resort to nuclear weapons.