New Delhi, Nov. 21 -- The president of Ukraine is facing a confluence of crises testing his ability to lead an increasingly weary nation nearly four years into a devastating full-scale invasion by Russia.

For more than a week, Volodymyr Zelenskyy has struggled to contain the fallout from a $100 million corruption scandal implicating top officials and other associates. The pressure on Zelenskyy has ratcheted up as the United States pushes a proposal it drew up with Russia that would require major concessions from Ukraine - and seemingly few from Russia - to bring an end to the war.

All this is playing out as Russia makes slow but steady advances across parts of the 1,000-kilometer (620-mile) front line and relentlessly bombs Ukraine's po...