The UK has accused Vladimir Putin of dragging his feet on a Ukraine ceasefire at a meeting of allies - at which more than £18bn in aid was pledged to Kyiv. Meanwhile, Donald Trump's envoy has ...

Volodymyr Zelenskyy has accused Russia of actively recruiting fighters in China, which Moscow and Beijing deny. Ukraine's leader earlier claimed 155 Chinese citizens were fighting for the Russian ...

Institute of Physics, University of Pécs, Ifjúság útja 6, Pécs H-7624, Hungary Department of Theoretical Physics, University of Szeged, Tisza Lajos krt. 84-86, Szeged H-6720, Hungary Department of ...