That comes amid reports his administration is weighing options, including sanctions, to pressure Russia into accepting a ceasefire deal, according to a report from The Wall Street Journal.

Ukrainian President Volodymyr Zelenskyy is set to travel to Berlin for talks with Germany's Friedrich Merz on Wednesday, according to Reuters news agency. 

Russia claims to have seized four border villages in Ukraine's northeastern Sumy region as it slowed an aerial bombardment on Ukraine as compared with previous nights.