Some NATO countries worry using any version of the term “Article 5” for Ukraine defense could weaken its deterrence.

U.S., Russian and Ukrainian negotiators are back around a table for a second round of technical talks, but in Kyiv, Russian bombs bring suffering and skepticism.

By Olena Harmash KYIV, Feb 4 (Reuters) - Ukrainian and Russian negotiators wrapped up the first day of new U.S.-brokered talks in Abu Dhabi on Wednesday, seeking to advance efforts to end Europe's biggest conflict since World War Two as fighting raged on.

Ukrainian President Volodymyr Zelenskyy says Russia launched a major attack on Ukraine with around 450 drones and 70 missiles, knocking out infrastructure and wounding at least 10 people

Volodymyr Zelensky has been talking up Russia’s battlefield fatalities and has asked his new Defense Minister to make it a priority.

Ukraine has agreed with western partners that persistent Russian violations of any future ceasefire agreement would be met by a co-ordinated military response from Europe and the US, according to people briefed on the discussions.

Envoys from Russia and Ukraine are meeting in Abu Dhabi for U.S.-brokered talks aimed at ending the nearly four-year war

The first phase of the Pentagon's drone competition, Gauntlet, begins later this month. US drone operators will fly and test the systems.