Dallas Sniper Attack
Five Dallas police killed by at least one sniper in one of the worst mass police shootings in recent U.S. history.
Biden proposes summit with Putin after Russia calls U.S. 'adversary' over Ukraine
WASHINGTON/MOSCOW (Reuters) -U.S. President Joe Biden called on Russian President Vladimir Putin on Tuesday to reduce tensions stirred by a Russian military build-up on Ukraine's border and proposed a summit of the estranged leaders to tackle a raft of disputes.