The founder of Russia's opposition Yabloko party, which wants a ceasefire in Ukraine, has said his party will keep campaigning despite the arrest of two senior figures, a move he said was meant to derail it before next year's parliamentary election.

If Russia attacks Ukraine again, the United States will respond militarily to the aggressor, said Polish Prime Minister Donald Tusk, who attended the Berlin summit on peace in Ukraine. Source: Polish online portal Onet News Quote from Tusk: "For the first time,

Since the release of the U.S. 28-point draft peace plan in late November, many officials and observers have suggested that a ceasefire in Ukraine may be

Ukraine’s domestic security service, the SBU, said Monday that it struck a Russian submarine in the Black Sea port of Novorossiysk, causing critical damage to the vessel and effectively disabling it.

Kremlin foreign policy aide Yury Ushakov said on Friday that a ceasefire in Ukraine is only possible after Kyiv's forces withdraw from the entire Donbas region, with the area they currently control taken over by Russian National Guard,

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

Ukraine’s leader said Wednesday he anticipates handing over a revised peace proposal to the US “in the near future.”