With the passing of time some of these prisoners have been released or, like Igor Sutyagin, exchanged with other countries for Russian agents held abroad. Nevertheless, the numbers continue to mount. According to some organisations there are now more than 300 individuals who have either been sentenced to terms of imprisonment in Russia, or are currently detained awaiting trial (in custody or under home arrest), or have fled abroad or gone into hiding, because of persecution for their beliefs and their attempts to exercise their rights under the Russian Constitution and international agreements.