The US state department says it is ‘incredibly’ concerned about Russia’s campaign of hybrid warfare against the west, amid fears it will escalate after Ukraine’s first use of US-made ATACMS long-range missiles on targets inside Russia,

The attack, using U.S.-supplied ATACMS missiles, is a signal the West wants to heighten the conflict, says Moscow's foreign minister.

The U.S. decision to authorise long-range Ukrainian strikes could help Kyiv defend the foothold in Russia's Kursk region that it seized as leverage in any war talks, but may come too late to change the course of the war,