been shuttling between the two at talks in vienna and at salvaging the 2015 nuclear deal, but robert mellon told al jazeera direct discussions are the best solution to such a complicated issue. >> we are prepared to -- we are prepared to meet with them face-to-face. we think it is far superior to indirect negotiations when dealing with something this complex with so much mistrust and so much potential for misunderstanding. we have said we will meet with them at any time, any place. they are the ones not prepared to do it, which we think is a mistake. >> u.s. president joe biden has held talks with his russian counterpart, but moscow denies it is building up military forces on the border of ukraine. at least 49 people have died in the southern mexican state of chiapas. most of those killed were migrants from honduras. several countries expand booster vaccine programs to contain covid-19 variants, and the who continues to oppose it. they will have organization says the priority should be to get everyone vaccinated. at least 41 people have been killed in burkina faso during an and verge -- an