President Barack Obama and Russian President Vladimir Putin have discussed how to have a safe and secure Olympics in Sochi.
The White House says the United States is offering its full assistance.
Mr O bama and Mr Putin spoke by phone yesterday amid security concerns for next month's Olympics.
Russian officials are hunting down three potential suicide bombers, including one believed in be in Sochi.
The US State Department is telling those attending the games to remain attentive to personal security. United States politicians have also expressed serious concerns.
The White House says Mr Obama and Mr Putin also discussed Syria's civil war and preparations for the peace conference starting this week in Switzerland, plus efforts to destroy Syria's chemical weapons.
Co-operation on Iran and the interim nuclear deal taking effect this week were also discussed.