Lithuania shared images of a new series of border defenses underway that are designed to stop a Russian advance into NATO.

One of these threats, and one notoriously hard to pick up, is Russian submarines. Climate change is making the task of finding them even more difficult. As the planet heats up, fresh water is seeping into the Arctic Ocean as the sea ice and the permafrost melts,

KYIV (Reuters) -Ukrainian President Volodymyr Zelenskiy said on Friday Russia was doing everything it could to stop a meeting between him and Vladimir Putin from taking place, and urged Ukraine's allies to put fresh sanctions on Moscow if it shows no interest in peace.

Russia has launched a rare drone and missile attack on western Ukraine, hitting an American-owned electronics plant among other targets and injecting further uncertainty into the U.S.-led efforts to e

General Christopher Donahue, commander of U.S. Army Europe and Africa, said allies could seize Kaliningrad "in a timeframe that is unheard of."

MOSCOW (Reuters) -Russian Foreign Minister Sergei Lavrov said there is no agenda for a potential summit between Russian President Vladimir Putin and his Ukrainian counterpart Volodymyr Zelenskiy, accusing Zelenskiy of saying "no to everything".

Rather than exploiting Russia’s weaknesses, a drone-centric NATO could be playing to Russia’s strengths, some experts warn.

French President Emmanuel Macron has warned that the global credibility of the United States and its NATO allies is on the line in Ukraine, as U.S. President Donald Trump attempts to end the Russian invasion once and for all.