U.S. President Joe Biden called the situation "very dangerous".
But Washington and its allies have increased military aid to Ukraine, including by providing tanks, advanced missiles and F-16 fighter jets.
A Kremlin spokesman said these were questions for the defence ministry and declined further comment.
The experts also urged other states who fought in Afghanistan to thoroughly review their own activities, especially any allegations of war crimes, with a view to...
Prior to Israel's offensive in Gaza, NATO member Turkey had been working to mend its long-strained ties with Israel.