"If this is true, then we have a major problem, Houston," wrote Estonian lawmaker Marko Mihkelson, in response to the report.

Ukraine’s chief negotiator, in an exclusive interview, says conceding sovereign territory is off-limits in peace talks.

Ukraine says it used sea drones to strike two oil tankers that are part of Russia’s sanctioned shadow fleet and were a few dozen kilometres off the coast of Turkey.

The strikes occurred in a strategic maritime corridor, raising concerns about energy security and navigational safety.

In a series of hardline statements -- his most extensive comments on the latest U.S.-proposed peace plan to date -- Putin repeated some of Russia's most hardline demands, including that Ukrainian troops must withdraw from territory Moscow claims. Putin ruled out signing any ceasefire deal before Ukrainian troops withdraw.

President Donald Trump says Ukraine and Russia are making progress in peace talks but called the conflict difficult to solve on Tuesday night.

Europe is considering seizing billions in Russian assets to support Ukraine, as proposed by U.S. President Donald Trump.

Even if a peace can be reached, it won’t be easy to solve the problem of Ukrainian civilians languishing in Russian jails. This is one prisoner’s story.

Russia's state communications watchdog threatened on Friday to block WhatsApp entirely if it fails to comply with Russian law, news agencies reported.