Trump has made no effort to use his leverage to force Putin into a deal, and the Russian leader has "no desire" to see war end, says former V.P. Dan Quayle.

Ukraine's defense ministry said on Monday that it officially approved the combat use of the Krampus, a ground vehicle that fires thermobaric rounds.

Underground schools in Ukraine protect children from war, however, some children can't attend as they live too far away.

Richard Haass, President Emeritus of the Council on Foreign Relations, speaks with CNN’s Wolf Blitzer about what he’s expecting from President Trump’s phone calls with Russia’s Vladimir Putin and Ukrainian President Zelensky.

Russian president Vladimir Putin has been briefed on a Moscow move to capture the Ukrainian region of Sumy, next to the frontier.

As peace talks ramp up, experts and officials are already working on a looming post-war threat: the potential large-scale proliferation of guns in Ukraine once they are no longer needed on the battlefield.

Professor Michael Clarke, Sky News' security and defence analyst, will be answering your Ukraine war questions again on Thursday. Use the form below to submit yours.

Ukraine's 425th separate assault regiment said its troops trained "hundreds of hours" to shoot small arms from atop speeding off-road bikes.