The terrifying Sarmat missile's development has been marred by setbacks, including one which suffered a "catastrophic failure" on the launch pad, leaving a smouldering crater.

Russia is set to deploy the RS-28 Sarmat intercontinental ballistic missile, known as 'Satan 2', to replace older missiles. This advanced nuclear missile can carry multiple warheads, reaching targets across the U.

Experts say the missile is more powerful than the Oreshnik used by Russia to strike Ukraine last week, but has been beset by 'catastrophic' failures