The Russian Foreign Ministry has issued a travel warning, saying that US intelligence services are on a "hunt" to detain Russian citizens traveling abroad. <br/><br/>In the statement, the ministry said the advice had been issued in connection with the threat of being detained or arrested at the request of US law enforcement and intelligence services in third countries. <br/><br/>The statement said despite Moscow's calls to improve cooperation between the relevant US and Russian authorities, US special services have effectively continued 'a hunt' for Russians around the world. <br/><br/>It said, considering these circumstances, Moscow strongly insists that Russian citizens carefully weigh up all the risks when planning trips abroad. <br/><br/>According to the statement issued today, more than 10 Russians have been detained in foreign countries at Washington's request since the beginning of 2017.