Russian President Vladimir Putin has warned the West not to cross a "red line" with Russia and condemned what he called a coup plot against Belarus.
The warning came in his annual state of the nation address, amid heightened tension with the West over Ukraine and jailed Putin critic Alexei Navalny.
"The use of unjust sanctions is growing into something more dangerous: a coup attempt in Belarus," he said.
He backs Belarusian President Alexander Lukashenko, who faces huge opposition.
On 17 April the Belarusian authorities announced that they had foiled a US-backed plot to assassinate President Lukashenko. They said Russia's FSB security service had helped them defeat the attempted coup.
The claim was dismissed by the exiled Belarusian opposition leader Svetlana Tikhanovskaya as a "provocation".
Warning to West
President Putin said Russia wanted good relations with all countries, but there were constant attempts by Western powers to "pick on" Russia.
"We don't want to burn bridges, but if somebody interprets our good intentions as weakness our reaction will be asymmetrical, rapid and harsh."
He said "we'll decide for ourselves in each case where the red line is".
Tensions have been building over Ukraine, as reports say Russia has moved more than 100,000 troops close to disputed areas.
A large part of that force is in Crimea, the peninsula which Russia annexed from Ukraine in 2014. A senior Ukrainian officer, Gen Serhiy Nayev, estimated the total force to be 103,200 last week.
Russia backs the separatists holding a swathe of eastern Ukraine, and its manoeuvres have fuelled fears of a new Russian military intervention.
Mr Putin's speech comes as anti-corruption campaigner Alexei Navalny, an arch-critic of the president, is being treated at a prison hospital in Vladimir, about 180km (112 miles) east of Moscow. He is on hunger strike and his allies say his life is in danger.
https://www.bbc.com/news/world-europe-56828813
