According to President Joe Biden, the US will not supply missile systems to Ukraine that can strike Russia.
The comments were made in response to allegations last week that Washington was ready to deliver advanced long-range missile systems to Kyiv.
Ukrainian officials have been looking for a longer-range system known as the Multiple Launch Rocket System, or MLRS, that can launch a barrage of rockets hundreds of kilometers away.
Russian Foreign Minister Sergey Lavrov has cautioned Western powers against supplying Ukraine with weapons capable of hitting Russian territory, warning such a move would be a “serious step towards unacceptable escalation”.
He was quoted by RT’s Arabic channel as saying he hoped “sane people” in Western countries would comprehend the danger of moves to further enhance Ukraine’s arsenal.
“There are still a few left there,” Lavrov said.
On Thursday, the Reuters news agency reported that Washington had held discussions with Kyiv about the danger of an escalation in the now more than three-month-long conflict if it were to launch attacks deep inside Russia, citing unnamed US and diplomatic officials.
However, the behind-the-scenes talks have not led to the imposition of explicit geographic restrictions on the use of weapons supplied to Ukrainian forces, the officials told Reuters.