New Delhi, Dec. 31 -- Russia's nuclear-capable Oreshnik missile system has entered active service in Belarus, Russia's Defense Ministry said Tuesday, as the U.S. efforts to broker a deal to end the nearly four-year war in Ukraine have entered a pivotal stage.

The ministry released a video showing combat vehicles that are part of the mobile intermediate range ballistic missile system driving across a forest as part of combat training. The ministry's announcement followed a statement from Belarusian President Alexander Lukashenko, who said earlier this month that the Oreshnik had arrived in the country. Lukashenko said that up to 10 such missile systems will be stationed in Belarus.

Russian President Vladimir Putin said earlier this month...