India, May 26 -- Belarus' exiled opposition leader visited Kyiv on Monday as the Ukrainian capital cleaned up after Russia's biggest missile attack of the year, and world leaders kept a close eye on how much support the Belarusian Government is ready to provide for Moscow's all-out invasion of Ukraine.

Russia and its ally Belarus held joint nuclear drills last week, and Ukrainian President Volodymyr Zelenskyy has increasingly warned in recent days that Belarus could provide a launchpad for Russia to open a new front in northern Ukraine. In a further sign that concerns about any Belarusian role are increasing, French President Emmanuel Macron spoke by phone with Belarusian President Alexander Lukashenko on Sunday, their first call since t...