Russia rejected on Wednesday both freezing the front line in Ukraine in its current position and stationing European peacekeeping troops in the region, Foreign Minister Sergei Lavrov said.

Earlier this week US President Donald Trump told reporters that Russian President Vladimir Putin would accept European troops in Ukraine to keep the peace.

Lavrov said Russia opposed the idea put forth that there is a line dividing both sides, with one part Russian and the other Ukrainian.

"That will not happen," he said, during a trip to Doha, the capital of the Gulf state of Qatar.

Lavrov said the Russian constitution defines the country's territory, Lavrov said and according to that, the Ukrainian regions of Luhansk, Donetsk, Zaporizhzhya and Kherson belong to Russia, even if Russian troops do not fully control them.