By Anita Komuves BEREGSURANY, Hungary (Reuters) – Clutching a mobile phone number of a woman she had never met, Nataliya Ableyeva crossed the border from Ukraine into Hungary on Saturday, entrusted with a precious cargo. A stranger’s children. Waiting at the border crossing on the Ukrainian side, Ableyeva had met a desperate 38-year-old man from her home town of Kamianets-Podilskyi, with his young son and daughter. The border guards would not let him pass. Ukraine has banned all Ukrainian men between the ages of 18 and 60 from leaving, so they can fight for their country. “Their father simply …