Washington made its views known in a telephone call from Secretary of State John Kerry to his Russian counterpart Sergei Lavrov, the State Department said.
"The secretary made clear that if such reports were accurate, these actions could further escalate the conflict, lead to greater loss of innocent life, increase refugee flows and risk confrontation with the anti-ISIL coalition operating in Syria," the State Department said.
In his call with Lavrov, Kerry discussed "US concerns about reports suggesting an imminent enhanced Russian buildup there," the department said.
The New York Times reported that Russia has sent a military advance team to ally Syria and was taking other steps that Washington fears may signal plans to vastly expand its military support for President Bashar al-Assad.
The Times said the moves included the recent transport of prefabricated housing units for hundreds of people to a Syrian airfield and the delivery of a portable air traffic control station there.
Russia's President Vladimir Putin was asked Friday whether Russia was taking part in military operations against the Islamic State group in Syria.
"To say we're ready to do this today -- so far it's premature to talk about this. But we are already giving Syria quite serious help with equipment and training soldiers, with our weapons," RIA Novosti state news agency quoted Putin as saying.
Russia's Foreign Ministry said Saturday's telephone call was made at Kerry's initiative.
It made no mention of US concerns about a possible Russian military buildup, but said the two men discussed "different aspects of the situation in Syria and its environs, as well as the objectives of the fight against IS and other terrorist groups."
Lavrov and Kerry agreed to remain in close contact in pursuing a settlement of the Syrian conflict, which has claimed more than 240,000 lives since March 2011 and driven millions more from their homes.
You’ve reached your limit of {{free_limit}} free articles this month.
Subscribe now for unlimited access.
Already subscribed? Log in
Subscribe to read the full story →
Smart Quarterly
₹900
3 Months
₹300/Month
Smart Essential
₹2,700
1 Year
₹225/Month
Super Saver
₹3,900
2 Years
₹162/Month
Renews automatically, cancel anytime
Here’s what’s included in our digital subscription plans
Exclusive premium stories online
Over 30 premium stories daily, handpicked by our editors


Complimentary Access to The New York Times
News, Games, Cooking, Audio, Wirecutter & The Athletic
Business Standard Epaper
Digital replica of our daily newspaper — with options to read, save, and share


Curated Newsletters
Insights on markets, finance, politics, tech, and more delivered to your inbox
Market Analysis & Investment Insights
In-depth market analysis & insights with access to The Smart Investor


Archives
Repository of articles and publications dating back to 1997
Ad-free Reading
Uninterrupted reading experience with no advertisements


Seamless Access Across All Devices
Access Business Standard across devices — mobile, tablet, or PC, via web or app
