President Zelensky said his country would not allow Russia to "earn additional billions on our blood".

The Russian troops have also been using electric scooters, motorcycles and ATVs, which allow them to disperse quickly across the front, a Ukrainian official told The Times. The stepped-up attacks have heightened longstanding concerns over how Ukraine manages its military and have countered assumptions that Moscow’s offensive would slow.

Russia’s once-dominant gas supply to Europe via Ukraine, which flowed for decades, is set to end on New Year’s Day with the collapse of a contract between the two warring countries that paid out billions to Moscow in gas revenue and to Kyiv in transit fees.

Russian gas flows through Ukraine are set to stop on Wednesday when a transit deal between the two countries expires in the wake of Moscow’s full-scale invasion. The pipeline was one of the last two routes still carrying Russian gas to Europe nearly three years into the full-scale war.

Russian natural gas flows to Europe across Ukraine appear poised to halt Wednesday, after a transit deal expires, raising the stakes for the continent’s energy security as it draws heavily on reserves.

MOSCOW (Reuters) -Russian energy company Gazprom said it would pump a reduced volume of gas to Europe via Ukraine on Tuesday, the last day before the expiry of a deal that had kept the gas flowing throughout nearly three years of war.

European infrastructure allows for the flow of gas from other countries, a European Commission representative said.

Russia has not nominated any gas flows from January 1 through the Ukrainian pipeline to Europe as of Tuesday, Ukraine’s gas transit operator said, according to a Reuters report. The development comes ahead of the expiration of a five-year contract between Gazprom and Ukraine’s Naftogaz.