A Russian official said a student attacked a vocational college Wednesday in Crimea, a rampage that killed 17 other students and left more than 40 people wounded, before killing himself.

Crimea is a part of Ukraine.

US claims that Russia hacked official emails, without evidence, are "indecent", the Kremlin has said.

Russia won't invade Ukraine on his presidential watch, Donald Trump said Sunday, adding that he would consider recognizing Russian President Vladimir Putin's seizure of Crimea.

ABC host George Stephanopoulos corrected Donald Trump after the Republican presidential nominee claimed that Russia was "not going to go into Ukraine."