Russia on Sunday extended military drills near Ukraine’s northern borders as Ukrainian President Volodymyr Zelensky said he supports an immediate ceasefire in the eastern portion of the country.

The exercises, originally set to end Sunday, brought a sizable contingent of Russian forces to neighboring Belarus, which borders Ukraine to the north. The presence of the Russian troops raised concern that they could be used to sweep down on the Ukrainian capital, Kyiv.

The extension of the drills was announced by Belarus’s defense minister, Gen. Viktor Khrenin, on social media.

“The preliminary results of the completed joint operational exercise ‘Allied Resolve-2022,’ conducted as part of a comprehensive check of the response forces of the Union State, have concluded,” he said on Telegram.

Also on Sunday, shelling was reported in eastern Ukraine, according to Ukrainian officials. On Saturday, Ukraine reported that two soldiers were killed by separatists’ shelling. Separatist leaders, however, accused Ukraine of attacking their forces over the weekend.