Ukraine-Russia crisis: What to know about rising fear of war

The Russia-Ukraine crisis has entered another day that is expected to be packed with diplomatic efforts to prevent the simmering tensions from boiling over into war

THE HAGUE, Netherlands -- The Russia-Ukraine crisis entered another day that is expected to be packed with diplomatic efforts to prevent the simmering tensions from boiling over into war.

Ukrainian President Volodymyr Zelenskyy is hosting Turkish President Recep Tayyip Erdogan for talks in Kyiv while Russian President Vladimir Putin meets his Argentinian counterpart Alberto Fernandez in Moscow.

NATO Secretary-General Jens Stoltenberg, meanwhile, voiced concerns that Russia continues to build up troop numbers along Ukraine's borders, including in Belarus.

Here are things to know Thursday about the international tensions surrounding Ukraine, which has an estimated 100,000 Russian troops massed along its borders.