Russia has massed more than 50,000 troops, including some of its best forces, near Ukraine's northeastern Sumy region, but Kyiv has taken steps to prevent them from conducting a large-scale offensive,

KYIV (Reuters) -Ukrainian President Volodymyr Zelenskiy has said that Russia has gathered 50,000 troops near Ukraine's northern Sumy region, but added that Kyiv had taken steps to prevent Moscow from conducting a large-scale offensive there.

The warnings over the offensive come as a U.S.-brokered peace process has limped along with inconclusive meetings and little concrete results.