The Kremlin said on Wednesday that strategic stability should be high on the agenda of a possible meeting between Russian President Vladimir Putin and U.S. President Joe Biden, alongside bilateral relations. Biden, who in March said he thought Putin was a "killer", prompting Moscow to recall its ambassador to Washington for consultations, has said he would like to hold talks with Putin during a trip to Europe next month. The White House has said that differences between Washington and Moscow would need to be resolved before such a meeting. The Kremlin has said it is studying the possibility of holding the summit.