The Capitol Building in Washington DC. File photoWASHINGTON, Jan 13 The United States believes in the possibility of reaching diplomatic agreements with Russia that will strengthen the security of Europe, US national security adviser Jake Sullivan told reporters. «We believe that diplomacy and diplomatic understanding, that can be achieved between the US, our European allies and partners and Russia, can increase the stability in Europe, that there is an opportunity to make progress on issues such as missiles and military exercises …, risk reduction and conflict management,» Sullivan said at the briefing at the White House.In the US, they talked about leverage against Russia in the event of an escalation in Ukraine