US President Donald Trump said he would speak with Russian president Vladimir Putin soon over the reported plague death of a laboratory technician and was prepared to help Russia if needed. (EPA Images pic)

WASHINGTON: US president Donald Trump said Tuesday he would speak very soon with Russian president Vladimir Putin over the reported plague death of a laboratory technician, as Washington pressured Moscow for transparency.

Russian authorities denied that they were imposing anti-plague measures and played down the reports of an incident at a plague research institute in Siberia's Irkutsk region last week.

However, Washington is showing growing concern, with state secretary Marco Rubio calling on Russia to be open about the situation.