"Firstly, the Danish, German and Swedish authorities refused to provide legal assistance requested by the Prosecutor-General's Office of the Russian Federation and the Federal Security Service of the Russian Federation," Nebenzia said in the letter.
Nebenzia said Denmark, Germany and Sweden have rejected without any plausible explanation all proposals to cooperate in investigating the September blasts at the Nord Stream pipelines.
"Denmark and Sweden stated that 'the execution of requests by the Russian Federation may endanger the security' of these States. Germany stated that it can entail 'possible prejudice to interests' of their country," the letter said.
Meanwhile, Russia urges members of the UN Security Council to support and co-sponsor its draft resolution on an investigation of the Nord Stream blasts, Russian Ambassador highlighted.
"We hope that the Security Council draft resolution we propose in this regard will help the Council to contribute constructively into this process," Nebenzia said in a letter to the UN Secretary-General and the UNSC President. "We call on Member States to support and cosponsor our draft."
In September, a series of explosions occurred on two Russian gas pipelines to Europe, Nord Stream and Nord Stream 2. Germany, Denmark and Sweden said the explosions could be a result of deliberate sabotage and launched their own investigations. The Russian Prosecutor General's Office initiated a case of international terrorism, with Russian President Vladimir Putin calling the attack on the pipelines an apparent terrorist attack.