Military equipment seen readying to fire in areas outside capital; 'hostage' Mariupol increasingly desperate, with aid not able to get in, and civilians unable to escape

Kyiv says that 20,000 foreigners from various nations have joined to help beat back invasion, including about 100 Americans, some of them veterans of Iraq and Afghanistan

17 injured in bombing of medical center in Mariupol according to city council; Kremlin says it'll look into airstrike but Russian foreign minister insists site was used by fighters

Meeting comes amid outrage in Kyiv over a Russian airstrike hitting a children's hospital, which Lavrov claims was a military base for Ukrainian extremists

Moscow demanding guarantees Western sanctions won't affect trade with Iran; US says it won't play 'Let's Make a Deal' with Moscow, as Iran accuses Washington of holding up talks

Economic experts say Kremlin expected punitive measures over invasion of Ukraine but not at the current level, with major companies and multinationals joining in

CIA chief predicts Russian leader could 'double down' without regard for civilians; top Pentagon official raises specter of tactical nukes, but no changes in nuclear posture seen

Coca-Cola, Starbucks, Pepsi and Yum! also suspend some operations as boycott pressure grows; Yale team says 290 large companies have withdrawn, but 30 remain

Washington officials say Moscow's firepower should not be 'underestimated' as suffering in Ukraine 'likely to get worse before it gets better'

Defending ban on news outlets Russia Today, Sputnik, top diplomat Borrell calls them 'weapons' wielded by Moscow; Latvian MEP accuses Putin of trying to 'poison, divide societies'