President Donald Trump issued a rare threat of nuclear escalation on Friday, saying he had ordered two nuclear submarines to be strategically positioned near Russia in response to what he said were aggressive remarks by Dmitry Medvedev,

By Phil Stewart, Jonathan Landay and Ryan Patrick Jones WASHINGTON (Reuters) -U.S. President Donald Trump on Friday said he had ordered two nuclear submarines to be positioned in "the appropriate regions" in response to remarks from former Russian President Dmitry Medvedev about the risk of war between the nuclear-armed adversaries.

The Ukrainian military said a Russian missile strike on a training facility in the north of the country killed at least three reservists and injured 18.

Authorities in Ukraine said a Russian drone and missile attack on the capital, Kyiv, killed at least 13 people, including a 6-year-old boy

Through July, Russia launched a record 6,443 drones and missiles into the country, according to data published by the Ukrainian air force. The total is the highest of the war to date, and around 13% more than were recorded in June.