News Kremlin critic Navalny held, then released ahead of Russian election 2018-02-22T09:18:50.000000000-05:00 MOSCOW (Reuters) - Russian opposition leader Alexei Navalny was briefly detained by police on Thursday and accused of organizing illegal protests, weeks ahead of a presidential election in which he has been barred from running. Trump says arming some teachers would stop shootings 'instantly' 2018-02-22T08:41:38.000000000-05:00 WASHINGTON (Reuters) - U.S. President Donald Trump on Thursday pushed his call to arm teachers following last week's school massacre in Florida, saying it would be limited to those with military or special training but "would solve the problem instantly." Trump says weighing possibility of 'the best' teachers having guns 2018-02-22T08:30:41.000000000-05:00 WASHINGTON (Reuters) - U.S. President Donald Trump on Thursday sought to clarify his support for arming teachers in the wake of a deadly school shooting in Florida, saying he only wanted to examine the idea and would limit it to those with military or special training. Uber will aggressively invest in Southeast Asia, won't let SoftBank rule it: CEO 2018-02-22T08:26:07.000000000-05:00 NEW DELHI (Reuters) - Uber Technologies Inc's [UBER.UL] chief executive pledged to continue investing aggressively in Southeast Asia even though the U.S. ride hailing firm expects to lose money in the fast growing market due to costly battles with rivals such as Grab. Man lobs grenade at U.S. embassy in Montenegro, then blows himself up 2018-02-22T08:15:02.000000000-05:00 PODGORICA (Reuters) - An unidentified man threw an explosive device, probably a hand grenade, at the U.S. embassy building in Podgorica, the capital of Montenegro, around midnight before blowing himself up, the government said on Thursday. U.N. pleads for truce to avert 'massacre' as strikes hit Syria's Ghouta for fifth day 2018-02-22T08:01:18.000000000-05:00 AMMAN (Reuters) - Warplanes pounded the last rebel enclave near the Syrian capital for a fifth straight day on Thursday, as the United Nations pleaded for a truce to halt one of the fiercest air assaults of the seven-year civil and prevent a "massacre". Exclusive: As Trump trashes NAFTA, Mexico turns to Brazilian corn 2018-02-22T07:44:25.000000000-05:00 CHICAGO/MEXICO CITY (Reuters) - Mexican buyers imported ten times more corn from Brazil last year amid concern that NAFTA renegotiations could disrupt their U.S. supplies, according to government data and top grains merchants. Buffett letter may tout optimism as broader market worries ebb 2018-02-22T07:40:42.000000000-05:00 (Reuters) - Warren Buffett may use part of his annual letter to Berkshire Hathaway Inc shareholders, due on Saturday, to renew his optimism about America, at a time economic growth is on the upswing and U.S. stocks sit near record highs despite rising interest rates. Easy fixes to school security prove elusive after Florida shooting 2018-02-22T07:06:55.000000000-05:00 (Reuters) - Two weeks before a gunman fatally shot 17 people at a Florida high school, Bill Lee, the president of the state's school administrators association, warned that Florida's schools were vulnerable to just such an attack. Russian opposition leader Navalny briefly held ahead of March election 2018-02-22T06:50:41.000000000-05:00 MOSCOW (Reuters) - Russian opposition leader Alexei Navalny was detained by police on Thursday but then released a short while later, weeks ahead of a presidential election in which he has been barred from running.