United States President Joe Biden will host Ukrainian counterpart Volodymyr Zelenskyy at the White House next week,  US National Security Advisor Jake Sullivan said on Friday (September 15), adding that the meeting comes at a time when Russia “desperately” seeks help from North Korea in war with Ukraine.United States President Joe Biden will host Ukrainian counterpart Volodymyr Zelenskyy at the White House next week,  US National Security Advisor Jake Sullivan said on Friday (September 15), adding that the meeting comes at a time when Russia “desperately” seeks help from North Korea in war with Ukraine.