World leaders gather for G20 To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video11/29/2018November 29, 2018In Argentina's capital Buenos Aires, global trade and climate change are on the agenda. But the escalating tensions between Ukraine and Russia will dominate – especially for two presidents who may or may not be meeting again after all.https://p.dw.com/p/39AiZAdvertisement