The US and Europe express growing concern over potential escalation in Russian hybrid warfare after Ukraine initiates long-range missile attacks inside Russia.

The move follows the US lifting restrictions on Ukraine's use of American-made missiles.

Responding to these events, Russia has pledged an 'appropriate' response and shifted its nuclear doctrine, raising international tensions.

Western officials suspect that Russia might expand sabotage efforts or enhance its support to US adversaries in various global regions.

Recent discussions among European ministers highlighted these apprehensions, with a joint statement accusing Russia of systematically threatening European security architecture.

US State Department spokesman Matthew Miller emphasized concern over global hybrid warfare from Russia, pointing to a recent sabotage on under-sea communication cables in the Baltic Sea as evidence of ongoing threats.

Meanwhile, Ukrainian forces are reported to have struck an ammunition depot in Russia's Bryansk region using Atacms missiles.

The US and Ukrainian officials confirm the attack, although the number of missiles successfully intercepted remains debated.

Russia's foreign minister, Sergei Lavrov, has vowed retaliation, perceiving this military move as entry into a new war phase by the West.

As Western nations prepare for potential infrastructure sabotage and hybrid attacks, NATO and EU emphasize the urgent need to protect critical infrastructure against Russian capabilities.

Despite the mounting tension, analysts suggest that Russia's military options may be restrained, predicting increased strikes on Ukrainian infrastructure instead.

The situation continues to evolve as both U.S. and European nations navigate the intricate impacts of these military developments.