Russia's tactical nuclear weapon drills are a response to statements from the West about sending troops to Ukraine, the Kremlin said on Monday.
Kremlin spokesman Dmitry Peskov cited comments by the French President Emmanuel Macron on possibly sending soldiers to Ukraine, as well as statements from the British and US Senate representatives.
Military and other special services are verifying reports about deployment of France's foreign legion in Ukraine, Peskov added.
"This is a completely new round of escalating tensions. It is unprecedented and requires special measures," the Kremlin spokesman said in a statement.