Without the New START treaty, which caps the number of deployed nuclear warheads at 1,550 on each side, there will be no limits on the U.S. and Russian arsenals.

Russia, Ukraine, and the United States concluded the second round of trilateral talks in Abu Dhabi on Feb. 4, with another round of peace discussions expected to follow on Feb. 5.

U.S., Russian and Ukrainian negotiators are meeting in the United Arab Emirates, but Russia continues to pummel Ukraine and has not softened demands that Kyiv calls unacceptable.

Also: dozens are feared to have been killed by gunmen in central Nigeria.

U.S. Special Envoy Steve Witkoff said Russia and Ukraine had agreed to make their first exchange of prisoners in five months, as trilateral talks continue in Abu Dhabi to end Moscow's war against its ...

Russian missiles and drones have pounded Ukraine’s energy grid in recent weeks, plunging people into frozen darkness in one of the country’s coldest winters on record.

If the ceasefire violation developed into a wider attack, three days after the initial breach, then a coordinated military response by a western-backed force involving the US military would be trigger...