Secretary of State Antony Blinken has reportedly approved the use of all US weapons against Russian targets, including targets inside Russia.
This takes away any plausible deniability from the U.S.
Below is a graphic showing the range of various U.S.-supplied weaponry. The regions showing in the color red are ALL inside Russia.
Once Ukraine begins using . . . for instance . . . . Extended Range HIMARS M39A1/M57 to hit targets inside Russia, the Russians can say the U.S. directly authorized the attacks and as such, both Ukraine AND the U.S. have attacked Russia.
The Russians repeatedly and publicly warned the US and NATO that such a decision would result in Russian attacks against the "Decision-making centers" of the nations that do this.
Blinken has just set the stage for our country to be attacked because of what HE is doing.