* No 'one size fits all' debt to GDP target - deputy fin min
* Russia also says G-20 should stick to prior currency pledge
* Japan will be questioned on domestic policies
By Anna Yukhananov
WASHINGTON, April 17 A debt-cutting proposal that the world's 20 largest economies plan to agree on later this year will have different targets for countries depending on their economic conditions, Russia's deputy finance minister said on Wednesday.
Russia also gave a hint of what to expect from the Group of 20 finance ministers' meeting later this week, saying the G-20 should stick to its previous pledge to avoid competitive devaluations and let the market determine exchange rates.
The new G-20 debt agreement is meant as a more ambitious follow-on to the plan agreed to in Toronto in 2010, which set specific debt to gross domestic product (GDP) targets for the Group of 20.
A document prepared ahead of the G-20 meeting this week showed that the group is considering a proposal to cut their public debt over the longer term to well below 90 percent of GDP.
Sergei Storchak, Russia's deputy finance minister, said the specific debt-to-GDP targets will differ among groups of countries based on economic conditions. Russia chairs the G-20 this year.
"The approach is going to be flexible and, maybe the most important, what is going to happen is a clear division between short-term goals and medium and long-term goals (for debt reduction)," he said. He was speaking at the Peterson Institute for International Economics in Washington, ahead of the G-20 meetings later this week.
"For us as a (G-20) club, it's very important that we have this common understanding that debt levels should be sustainable. ... And in different nations sustainability can mean different figures."
Storchak said the debt agreement would come sometime this year, either during the meeting of G-20 finance ministers in July, or the G-20 summit in St. Petersburg in September.
"If we agree on measures higher than those taken in Toronto, we would consider our presidency a big success," he said.
Speaking at the same event as Storchak, Ksenia Yudayeva, Russia's G-20 coordinator or "sherpa," said countries should also stick to their commitment to market-determined exchange rates, first made during the last G-20 and Group of Seven meetings in February.
Concerns about 'currency wars' re-emerged after the Bank of Japan joined other major central banks in aggressive policy stimulus earlier this month, pledging to inject $1.4 trillion over the next two years to shock the economy out of decades of stagnation, sending the yen sharply lower.
Global policymakers have said Japan's stimulus would dominate discussions on the world economy at the G-20, World Bank and International Monetary Fund meetings this week - especially the effect of ultra-loose policies on asset prices and risks of stoking speculative buying.
Storchak said it was still too early to make any judgments about Japan's policies, and leaders must first hear how about Japan's motivations and how its actions are affecting its trading partners.
U.S. Treasury Secretary Jacob Lew said earlier on Wednesday that it was important for Japan to encourage growth, but Washington was watching Japan's policies closely to ensure Tokyo stuck by its G-7 currency pledge.
But Storchak saved some harsher words for the United States, which alone is holding up key IMF reforms aimed at boosting the voting power of emerging economies.
U.S. lawmakers last month rebuffed a request by the Obama administration to approve a permanent increase in U.S. funding to the IMF, a necessary change in order to finalize a historic plan that would make China the IMF's third-largest member.
The quota reform cannot proceed without the United States, which holds a controlling share of IMF votes.
"Frankly speaking, some of us are losing patience already. The decision of this nation is very important for all," Storchak said, referring to the United States.
"It looks like there's no way for us but to interfere. Whether it's going to happen this week, or afterwards, we'll see."