Russia plans to use nuclear weapons in the Black Sea near Ukraine's borders

This is reported by The Times, citing military sources.

The Kremlin is signaling readiness for a major escalation as Russia loses ground on the battlefield. Concerns about Putin's previous hints that he might go for such tactics.

Also, fears are intensifying against the background of information about the possible departure of a secret train to Ukraine, which controls a secret nuclear unit.

The train, seen in central Russia, was linked to the 12th main directorate of the Russian Ministry of Defense and is responsible for nuclear weapons, their storage, maintenance, transportation and issuance to units, Polish defense analyst Konrad Muzyka told the publication.