* Rouble close to low reached after Crimea annexed in March
* Dollar denominated shares down 3.5 percent over the week
* Savings on imports outweighed by investor exodus-analysts
* Car sales plummet, trend unlikely to be reversed (Updates with closing prices)
By Jason Bush and Vladimir Abramov
MOSCOW, Aug 8 (Reuters) - The rouble ended the week close to an all-time low following Moscow's decision to ban most food imports from the West in retaliation for sanctions over Ukraine and warnings from NATO that Russia appeared ready to invade its neighbour.
Analysts said any positive impact on Russia's balance of payments from Thursday's ban was outweighed by an investor exodus due to the conflict since mid-April between pro-Russian rebels and government forces in eastern Ukraine.
"The markets are preparing for the worst based on what's going on in east Ukraine, where the fighting continues, no one wants to agree with anyone and Russia is building up troops on the border," said Igor Akinshin from Alfa Bank.
The rouble eased 1.5 percent versus the dollar this week , not far off an all-time low of 36.73 reached in March after Russia annexed Ukraine's Crimea peninsula. Dollar denominated Russian stocks were down 3.5 percent.
The ban on all meat, fish, dairy, fruit and vegetables from the United States, the 28 European Union countries, Canada, Australia and non-EU member Norway will last a year, showing President Vladimir Putin is preparing for a long stand-off.
A stronger than expected measure, it could isolate Russian consumers to a degree unseen since Soviet days. Sanctions and the currency's slide have already bankrupted several airlines and tourist firms, ruining summer holidays for many Russians.
The government has also upset the middle class by approving a plan to use contributions to employees' privately managed pension funds to plug budget holes for a second year running.
In a sign ordinary Russians' purchasing power is declining, car sales slumped 23 percent year-on-year in July after a 17.3 percent decline in the previous month.
"The overall trend is worrisome, and unlikely to improve fundamentally any time soon," said Joerg Schreiber, Chairman of the Automobile Manufacturers Committee at the Association of European Businesses lobby group.
State-controlled VTB and Dutch bank ING said investors chose to ignore the potential positive implications of the import ban.
"The import ban is marginally positive in a 6-12 month period as a general factor affecting the current account, but currently capital outflows are still on a higher scale than this," said Dmitry Polevoy, Russia economist at ING.
Russians tracked the rouble-dollar rate very closely in the 1990s and early 2000s as they saw the U.S. currency as the best protection against galloping inflation.
That attitude has changed during Putin's 14-year rule, when relative macroeconomic stability on the back of high oil prices allowed people to forget about foreign exchange rates.
That now seems to be coming to an end with the bans likely to push inflation well above the government's targets and disappointed investors sending billions of dollars abroad as capital flight accelerates.
"Another round of more hawkish actions and rhetoric could put additional pressure on the rouble," VTB said on Friday. "Capital outflows - namely the potential dollarisation of deposits - are the key risks".
Analysts polled by Reuters at the end of last month predicted that capital outflows would reach $118 billion this year, almost double last year's figure.
ING economist Polevoy estimated that the ban on western food imports would save Russia around $800 million a month, a figure probably less than the increase in capital flight as investors flee rouble assets.
"So currently nobody cares about the current account, nobody cares about the trade balance, probably nobody even cares about the high carry (high interest rates) in Russia. People who just want to get out of the country, out of Russian assets, are trying to do it."
Investors fear a further escalation following statements from NATO that Russia has amassed large numbers of troops on the border and may invade under the guise of a peacekeeping operation. Moscow has accused Kiev of killing hundreds of civilians in east Ukraine but has denied it has any plan to send troops across the border.
On Friday, the rouble strengthened slightly on the day and shares were up more than 1 percent, recovering from earlier losses, after a senior Russian security official said Moscow was willing to act as an intermediary to de-escalate the crisis.
Some analysts were sceptical.
"Talk is cheap, and Moscow has many times previously made similar comments calling for negotiations, de-escalation, et al, but its actions on the ground have suggested other things," said Timothy Ash, chief emerging markets analyst at Standard Bank.
For rouble poll data see
For Russian equities guide see
For Russian treasury bonds see