While US officials talked up progress in Berlin, there was little detail on how the issue of Ukraine's sovereignty would be resolved.

By Andreas Rinke, Tom Balmforth and Steve Holland BERLIN/WASHINGTON, Dec 15 (Reuters) - U.S. negotiators have offered to provide NATO-style security guarantees for Kyiv as U.S. and European negotiators reported progress in talks on Monday to end the war with Russia,

The United States, Ukraine and major European countries have reached consensus on 90 percent of terms for a deal to end Ukraine’s war with Russia, two senior U.S. officials said Monday, but

US negotiators offered more significant security guarantees to Kyiv as part of President Donald Trump’s renewed push to end the Russia-Ukraine war, but the effort still appeared part of a bid to pressure President Volodymyr Zelenskiy on territory.

A 1,000-strong "dark fleet" of rogue tankers evading sanctions has become a new target for the U.S. and Ukraine, according to a senior maritime intelligence analyst.

Ukraine claimed it carried out an underwater drone strike on Dec. 15, the first such attack in maritime warfare, that critically damaged a Russian Kilo-class attack submarine at the Russian port of Novorossiysk,

Germany will host U.S. and Ukrainian delegations over the weekend for talks on a ceasefire in Ukraine, before a summit with European leaders and President Volodymyr Zelenskiy in Berlin on Monday, a German official said.

Ukrainian President Volodymyr Zelenskyy has expressed willingness to drop Ukraine's NATO bid in exchange for Western security guarantees.