Assange has been living inside the embassy since June 2012, when he entered the building to avoid extradition to Sweden to face questioning about allegations of sex crimes, which he has always denied.
Assange also questioned the decision by Britain and more than 20 countries to retaliate against the poisoning by expelling Russian diplomats deemed spies.
"That 21 USA allies have expelled diplomats over an unresolved event in the United Kingdom and that the US expelled almost three times as many diplomats as the United Kingdom, the alleged victim country, helps the Kremlin further a narrative that it is under conspiratorial siege led by the US", he wrote on Twitter.
As part of an agreement between Assange and Ecuador, he is not allowed to send any messages that could interfere with the South American nation's relations with other countries, NBC News reported.
Ecuador said Wednesday it has suspended outside communications for Julian Assange at its London embassy after he published message critical of the British government.
Assange could face charges in the United States that include espionage, conspiracy and theft over the publication of classified US documents on WikiLeaks.
Despite no in-room internet connection, Assange has responded on Twitter.
But the comment that might have been the straw that broke the camel's back is his response to U.K.'s Europe and the Americas Minister Alan Duncan, who called Assange a "miserable little worm" that should walk out of the embassy and give himself up to British justice.
The Swedish investigation was dropped in May a year ago, but Assange, who was on bail at the time when he walked into the embassy, faces arrest by the British authorities for breaching his bail terms should he step outside.
In December, Ecuador made Assange a citizen and unsuccessfully tried to register him as a diplomat with immunity as part of its efforts to have him leave the facility without risk of being detained.
"The important thing is to continue to dialogue with Britain to find a definitive and lasting solution to this situation that the current government has inherited from the previous administration", she said.