MOSCOW - Russian Foreign Minister Sergei Lavrov said on Thursday that Russian forces would respond to the delivery of longer-range Western weapons to Kyiv by trying to push Ukrainian forces further away from its borders to create a safe buffer zone.

In an interview on state TV, Lavrov said everybody wanted the conflict in Ukraine - which Moscow calls a "special military operation" - to end, but that the West's support for Kyiv was playing an important role in how Russia approached the campaign.

Two U.S. officials told Reuters on Tuesday that Washington was preparing a new package of military aid worth $2.2 billion which is expected to include longer-range rockets for the first time.

"...We're now seeking to push back Ukrainian army artillery to a distance that will not pose a threat to our territories," said Lavrov.

"...The greater the range of the weapons supplied to the Kyiv regime the more we will have to push them back from territories which are part of our country."

Longer-range rockets would allow Ukraine - which has said it plans to retake all of its territory by force, including annexed Crimea - to strike deeper into Russian-held territory.

The Kremlin said on Wednesday that such rockets would escalate the conflict but not change its course.

President Vladimir Putin sent tens of thousands of Russian troops into Ukraine in February last year. He has said the operation was needed to protect Russia's own security and to stand up to what he has described as Western efforts to contain and weaken Moscow.

Ukraine and the West accuse Russia of waging an illegal war designed to expand its territory.

  - Reuters